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https://github.com/onceupon/Bash-Oneliner.git
synced 2024-11-23 21:27:00 +00:00
Make formatting and names more consistent
Signed-off-by: Edwin Kofler <edwin@kofler.dev>
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Edwin Kofler
parent
212326d7a3
commit
88e095d5fc
88
README.md
88
README.md
@ -75,15 +75,15 @@ sudo !!
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##### Run last command and change some parameter using caret substitution (e.g. last command: echo 'aaa' -> rerun as: echo 'bbb')
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```bash
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#last command: echo 'aaa'
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# last command: echo 'aaa'
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^aaa^bbb
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#echo 'bbb'
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#bbb
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#Notice that only the first aaa will be replaced, if you want to replace all 'aaa', use ':&' to repeat it:
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# Notice that only the first aaa will be replaced, if you want to replace all 'aaa', use ':&' to repeat it:
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^aaa^bbb^:&
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#or
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# or
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!!:gs/aaa/bbb/
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```
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@ -218,7 +218,7 @@ echo ${var[@]#0}
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##### Grep lines with strings from a file (e.g. lines with 'stringA or 'stringB' or 'stringC')
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```bash
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#with grep
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# with grep
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test="stringA stringB stringC"
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grep ${test// /\\\|} file.txt
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# turning the space into 'or' (\|) in grep
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@ -318,7 +318,7 @@ grep -c "^$"
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##### Grep and return only integer
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```bash
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grep -o '[0-9]*'
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#or
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# or
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grep -oP '\d*'
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```
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##### Grep integer with certain number of digits (e.g. 3)
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@ -341,7 +341,7 @@ grep -Po '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}'
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```bash
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grep -w 'target'
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#or using RE
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# or using RE
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grep '\btarget\b'
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```
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##### Grep returning lines before and after match (e.g. 'bbo')
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@ -379,7 +379,7 @@ grep -v '^#' file.txt
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##### Grep variables with space within it (e.g. myvar="some strings")
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```bash
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grep "$myvar" filename
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#remember to quote the variable!
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# remember to quote the variable!
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```
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##### Grep only one/first match (e.g. 'bbo')
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@ -458,8 +458,8 @@ grep $'\t'
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```bash
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$echo "$long_str"|grep -q "$short_str"
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if [ $? -eq 0 ]; then echo 'found'; fi
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#grep -q will output 0 if match found
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#remember to add space between []!
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# grep -q will output 0 if match found
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# remember to add space between []!
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```
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##### Grep strings between a bracket()
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@ -545,7 +545,7 @@ sed -i '$ s/.$//' filename
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##### Add string to beginning of file (e.g. "\[")
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```bash
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sed -i '1s/^/[/' file
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sed -i '1s/^/[/' filename
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```
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##### Add string at certain line number (e.g. add 'something' to line 1 and line 3)
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@ -692,7 +692,7 @@ sed '$ s/.$//'
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##### Insert character at specified position of file (e.g. AAAAAA --> AAA#AAA)
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```bash
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sed -r -e 's/^.{3}/&#/' file
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sed -r -e 's/^.{3}/&#/' filename
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```
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@ -747,7 +747,7 @@ awk -v N=7 '{print}/bbo/&& --N<=0 {exit}'
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##### Print filename and last line of all files in directory
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```bash
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ls|xargs -n1 -I file awk '{s=$0};END{print FILENAME,s}' file
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ls|xargs -n1 -I file awk '{s=$0};END{print FILENAME,s}' filename
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```
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##### Add string to the beginning of a column (e.g add "chr" to column $3)
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@ -757,12 +757,12 @@ awk 'BEGIN{OFS="\t"}$3="chr"$3'
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##### Remove lines with string (e.g. 'bbo')
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```bash
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awk '!/bbo/' file
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awk '!/bbo/' filename
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```
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##### Remove last column
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```bash
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awk 'NF{NF-=1};1' file
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awk 'NF{NF-=1};1' filename
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```
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##### Usage and meaning of NR and FNR
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@ -827,7 +827,7 @@ awk '{printf("%s\t%s\n",NR,$0)}'
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# David cat
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# David dog
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awk '{split($2,a,",");for(i in a)print $1"\t"a[i]}' file
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awk '{split($2,a,",");for(i in a)print $1"\t"a[i]}' filename
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# Detail here: http://stackoverflow.com/questions/33408762/bash-turning-single-comma-separated-column-into-multi-line-string
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```
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@ -941,7 +941,7 @@ find /dir/to/A -type f -name "*.py" -print 0| xargs -0 -r -I file cp -v -p file
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##### With sed
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```bash
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ls |xargs -n1 -I file sed -i '/^Pos/d' file
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ls |xargs -n1 -I file sed -i '/^Pos/d' filename
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```
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##### Add the file name to the first line of file
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@ -1053,8 +1053,8 @@ else
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fi
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# if variable is null
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if [ ! -s "myvariable" ]; then echo -e "variable is null!" ; fi
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#True of the length if "STRING" is zero.
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if [ ! -s "$myvariable" ]; then echo -e "variable is null!" ; fi
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# True of the length if "STRING" is zero.
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# Using test command (same as []), to test if the length of variable is nonzero
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test -n "$myvariable" && echo myvariable is "$myvariable" || echo myvariable is not set
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@ -1091,7 +1091,7 @@ if [[ $age -gt 21 ]]; then echo -e "forever 21!!" ; fi
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```bash
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# Echo the file name under the current directory
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for i in $(ls); do echo file $i; done
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#or
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# or
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for i in *; do echo file $i; done
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# Make directories listed in a file (e.g. myfile)
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@ -1104,10 +1104,10 @@ for i in $(cat tpc_stats_0925.log |grep failed|grep -o '\query\w\{1,2\}'); do ca
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oifs="$IFS"; IFS=$'\n'; for line in $(cat myfile); do ...; done
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while read -r line; do ...; done <myfile
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#If only one word a line, simply
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# If only one word a line, simply
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for line in $(cat myfile); do echo $line; read -n1; done
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#Loop through an array
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# Loop through an array
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for i in "${arrayName[@]}"; do echo $i; done
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```
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@ -1216,7 +1216,7 @@ TMOUT=10
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##### Set how long you want to run a command
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```bash
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#This will run the command 'sleep 10' for only 1 second.
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# This will run the command 'sleep 10' for only 1 second.
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timeout 1 sleep 10
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```
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@ -1585,7 +1585,7 @@ who -r
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##### Change SysV runlevel (e.g. 5)
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```bash
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init 5
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#or
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# or
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telinit 5
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```
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@ -1787,7 +1787,7 @@ pushd .
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# then pop
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popd
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#or use dirs to display the list of currently remembered directories.
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# or use dirs to display the list of currently remembered directories.
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dirs -l
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```
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@ -1798,7 +1798,7 @@ df -h
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# or
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du -h
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#or
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# or
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du -sk /var/log/* |sort -rn |head -10
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```
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@ -1828,7 +1828,7 @@ runlevel
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```bash
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init 3
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#or
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# or
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telinit 3
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```
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@ -2145,7 +2145,7 @@ ps aux|grep python
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```bash
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ps -p <PID>
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#or
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# or
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cat /proc/<PID>/status
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cat /proc/<PID>/stack
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cat /proc/<PID>/stat
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@ -2193,21 +2193,21 @@ sudo dpkg --purge <package_name>
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```bash
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ssh -f -L 9000:targetservername:8088 root@192.168.14.72 -N
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#-f: run in background; -L: Listen; -N: do nothing
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#the 9000 of your computer is now connected to the 8088 port of the targetservername through 192.168.14.72
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#so that you can see the content of targetservername:8088 by entering localhost:9000 from your browser.
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# the 9000 of your computer is now connected to the 8088 port of the targetservername through 192.168.14.72
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# so that you can see the content of targetservername:8088 by entering localhost:9000 from your browser.
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```
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##### Get process ID of a process (e.g. sublime_text)
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```bash
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#pidof
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# pidof
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pidof sublime_text
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#pgrep, you don't have to type the whole program name
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# pgrep, you don't have to type the whole program name
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pgrep sublim
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#pgrep, echo 1 if process found, echo 0 if no such process
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# pgrep, echo 1 if process found, echo 0 if no such process
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pgrep -q sublime_text && echo 1 || echo 0
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#top, takes longer time
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# top, takes longer time
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top|grep sublime_text
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```
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@ -2490,7 +2490,7 @@ $ sudo nc -l 80
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##### Check which ports are listening for TCP connections from the network
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```bash
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#notice that some companies might not like you using nmap
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# note that some companies might not like you using nmap
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nmap -sT -O localhost
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# check port 0-65535
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@ -2498,7 +2498,7 @@ nmap -p0-65535 localhost
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```
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##### Check if a host is up and scan for open ports, also skip host discovery.
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```bash
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#skips checking if the host is alive which may sometimes cause a false positive and stop the scan.
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# skips checking if the host is alive. this may sometimes cause a false positive, stopping the scan.
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$ nmap google.com -Pn
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# Example output:
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@ -2520,7 +2520,7 @@ $ nmap -A -T4 scanme.nmap.org
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# -A to enable OS and version detection, script scanning, and traceroute; -T4 for faster execution
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```
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##### Look up website information (e.g. name server), searches for an object in a RFC 3912 database.
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##### Look up website information (e.g. name server), searches for an object in a RFC 3912 database
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```bash
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whois google.com
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```
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@ -2731,11 +2731,11 @@ comm -23 fileA fileB
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```bash
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nl fileA
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#or
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# or
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nl -nrz fileA
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# add leading zeros
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#or
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# or
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nl -w1 -s ' '
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# making it simple, blank separate
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```
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@ -2870,7 +2870,7 @@ echo -e 'text here \c'
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##### View first 50 characters of file
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```bash
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head -c 50 file
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head -c 50 filename
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```
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##### Cut and get last column of a file
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@ -2926,9 +2926,9 @@ echo 'hihi' >>filename
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##### Working with json data
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```bash
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#install the useful jq package
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#sudo apt-get install jq
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#e.g. to get all the values of the 'url' key, simply pipe the json to the following jq command(you can use .[]. to select inner json, i.e jq '.[].url')
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# Install the useful jq package
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# sudo apt-get install jq
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# e.g. to get all the values of the 'url' key, simply pipe the json to the following jq command(you can use .[]. to select inner json, i.e jq '.[].url')
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cat file.json | jq '.url'
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```
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@ -3001,7 +3001,7 @@ while read a b; do yes $b |head -n $a ; done <test.txt
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## Others
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[[back to top](#handy-bash-one-liners)]
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##### Describe the format and characteristics of image files.
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##### Describe the format and characteristics of image files
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```bash
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identify myimage.png
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#myimage.png PNG 1049x747 1049x747+0+0 8-bit sRGB 1.006MB 0.000u 0:00.000
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@ -3124,7 +3124,7 @@ history -w
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vi ~/.bash_history
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history -r
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#or
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# or
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history -d [line_number]
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```
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