From 88e095d5fc0e08ca6c831b011fe676c613d11966 Mon Sep 17 00:00:00 2001 From: Edwin Kofler Date: Sat, 18 Nov 2023 13:43:12 -0800 Subject: [PATCH] Make formatting and names more consistent Signed-off-by: Edwin Kofler --- README.md | 88 +++++++++++++++++++++++++++---------------------------- 1 file changed, 44 insertions(+), 44 deletions(-) diff --git a/README.md b/README.md index bd57e1c..7c91e64 100644 --- a/README.md +++ b/README.md @@ -75,15 +75,15 @@ sudo !! ##### Run last command and change some parameter using caret substitution (e.g. last command: echo 'aaa' -> rerun as: echo 'bbb') ```bash -#last command: echo 'aaa' +# last command: echo 'aaa' ^aaa^bbb #echo 'bbb' #bbb -#Notice that only the first aaa will be replaced, if you want to replace all 'aaa', use ':&' to repeat it: +# Notice that only the first aaa will be replaced, if you want to replace all 'aaa', use ':&' to repeat it: ^aaa^bbb^:& -#or +# or !!:gs/aaa/bbb/ ``` @@ -218,7 +218,7 @@ echo ${var[@]#0} ##### Grep lines with strings from a file (e.g. lines with 'stringA or 'stringB' or 'stringC') ```bash -#with grep +# with grep test="stringA stringB stringC" grep ${test// /\\\|} file.txt # turning the space into 'or' (\|) in grep @@ -318,7 +318,7 @@ grep -c "^$" ##### Grep and return only integer ```bash grep -o '[0-9]*' -#or +# or grep -oP '\d*' ``` ##### Grep integer with certain number of digits (e.g. 3) @@ -341,7 +341,7 @@ grep -Po '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}' ```bash grep -w 'target' -#or using RE +# or using RE grep '\btarget\b' ``` ##### Grep returning lines before and after match (e.g. 'bbo') @@ -379,7 +379,7 @@ grep -v '^#' file.txt ##### Grep variables with space within it (e.g. myvar="some strings") ```bash grep "$myvar" filename -#remember to quote the variable! +# remember to quote the variable! ``` ##### Grep only one/first match (e.g. 'bbo') @@ -458,8 +458,8 @@ grep $'\t' ```bash $echo "$long_str"|grep -q "$short_str" if [ $? -eq 0 ]; then echo 'found'; fi -#grep -q will output 0 if match found -#remember to add space between []! +# grep -q will output 0 if match found +# remember to add space between []! ``` ##### Grep strings between a bracket() @@ -545,7 +545,7 @@ sed -i '$ s/.$//' filename ##### Add string to beginning of file (e.g. "\[") ```bash -sed -i '1s/^/[/' file +sed -i '1s/^/[/' filename ``` ##### Add string at certain line number (e.g. add 'something' to line 1 and line 3) @@ -692,7 +692,7 @@ sed '$ s/.$//' ##### Insert character at specified position of file (e.g. AAAAAA --> AAA#AAA) ```bash -sed -r -e 's/^.{3}/&#/' file +sed -r -e 's/^.{3}/&#/' filename ``` @@ -747,7 +747,7 @@ awk -v N=7 '{print}/bbo/&& --N<=0 {exit}' ##### Print filename and last line of all files in directory ```bash -ls|xargs -n1 -I file awk '{s=$0};END{print FILENAME,s}' file +ls|xargs -n1 -I file awk '{s=$0};END{print FILENAME,s}' filename ``` ##### Add string to the beginning of a column (e.g add "chr" to column $3) @@ -757,12 +757,12 @@ awk 'BEGIN{OFS="\t"}$3="chr"$3' ##### Remove lines with string (e.g. 'bbo') ```bash -awk '!/bbo/' file +awk '!/bbo/' filename ``` ##### Remove last column ```bash -awk 'NF{NF-=1};1' file +awk 'NF{NF-=1};1' filename ``` ##### Usage and meaning of NR and FNR @@ -827,7 +827,7 @@ awk '{printf("%s\t%s\n",NR,$0)}' # David cat # David dog -awk '{split($2,a,",");for(i in a)print $1"\t"a[i]}' file +awk '{split($2,a,",");for(i in a)print $1"\t"a[i]}' filename # Detail here:　http://stackoverflow.com/questions/33408762/bash-turning-single-comma-separated-column-into-multi-line-string ``` @@ -941,7 +941,7 @@ find /dir/to/A -type f -name "*.py" -print 0| xargs -0 -r -I file cp -v -p file ##### With sed ```bash -ls |xargs -n1 -I file sed -i '/^Pos/d' file +ls |xargs -n1 -I file sed -i '/^Pos/d' filename ``` ##### Add the file name to the first line of file @@ -1053,8 +1053,8 @@ else fi # if variable is null -if [ ! -s "myvariable" ]; then echo -e "variable is null!" ; fi -#True of the length if "STRING" is zero. +if [ ! -s "$myvariable" ]; then echo -e "variable is null!" ; fi +# True of the length if "STRING" is zero. # Using test command (same as []), to test if the length of variable is nonzero test -n "$myvariable" && echo myvariable is "$myvariable" || echo myvariable is not set @@ -1091,7 +1091,7 @@ if [[ $age -gt 21 ]]; then echo -e "forever 21!!" ; fi ```bash # Echo the file name under the current directory for i in $(ls); do echo file $i; done -#or +# or for i in *; do echo file $i; done # Make directories listed in a file (e.g. myfile) @@ -1104,10 +1104,10 @@ for i in $(cat tpc_stats_0925.log |grep failed|grep -o '\query\w\{1,2\}'); do ca oifs="$IFS"; IFS=$'\n'; for line in $(cat myfile); do ...; done while read -r line; do ...; done -#or +# or cat /proc//status cat /proc//stack cat /proc//stat @@ -2193,21 +2193,21 @@ sudo dpkg --purge ```bash ssh -f -L 9000:targetservername:8088 root@192.168.14.72 -N #-f: run in background; -L: Listen; -N: do nothing -#the 9000 of your computer is now connected to the 8088 port of the targetservername through 192.168.14.72 -#so that you can see the content of targetservername:8088 by entering localhost:9000 from your browser. +# the 9000 of your computer is now connected to the 8088 port of the targetservername through 192.168.14.72 +# so that you can see the content of targetservername:8088 by entering localhost:9000 from your browser. ``` ##### Get process ID of a process (e.g. sublime_text) ```bash -#pidof +# pidof pidof sublime_text -#pgrep, you don't have to type the whole program name +# pgrep, you don't have to type the whole program name pgrep sublim -#pgrep, echo 1 if process found, echo 0 if no such process +# pgrep, echo 1 if process found, echo 0 if no such process pgrep -q sublime_text && echo 1 || echo 0 -#top, takes longer time +# top, takes longer time top|grep sublime_text ``` @@ -2490,7 +2490,7 @@ $ sudo nc -l 80 ##### Check which ports are listening for TCP connections from the network ```bash -#notice that some companies might not like you using nmap +# note that some companies might not like you using nmap nmap -sT -O localhost # check port 0-65535 @@ -2498,7 +2498,7 @@ nmap -p0-65535 localhost ``` ##### Check if a host is up and scan for open ports, also skip host discovery. ```bash -#skips checking if the host is alive which may sometimes cause a false positive and stop the scan. +# skips checking if the host is alive. this may sometimes cause a false positive, stopping the scan. $ nmap google.com -Pn # Example output: @@ -2520,7 +2520,7 @@ $ nmap -A -T4 scanme.nmap.org # -A to enable OS and version detection, script scanning, and traceroute; -T4 for faster execution ``` -##### Look up website information (e.g. name server), searches for an object in a RFC 3912 database. +##### Look up website information (e.g. name server), searches for an object in a RFC 3912 database ```bash whois google.com ``` @@ -2731,11 +2731,11 @@ comm -23 fileA fileB ```bash nl fileA -#or +# or nl -nrz fileA # add leading zeros -#or +# or nl -w1 -s ' ' # making it simple, blank separate ``` @@ -2870,7 +2870,7 @@ echo -e 'text here \c' ##### View first 50 characters of file ```bash -head -c 50 file +head -c 50 filename ``` ##### Cut and get last column of a file @@ -2926,9 +2926,9 @@ echo 'hihi' >>filename ##### Working with json data ```bash -#install the useful jq package -#sudo apt-get install jq -#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') +# Install the useful jq package +# sudo apt-get install jq +# 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') cat file.json | jq '.url' ``` @@ -3001,7 +3001,7 @@ while read a b; do yes $b |head -n $a ; done