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README.md
39
README.md
@ -30,7 +30,7 @@ Here's a more stylish version of [Bash-Oneliner](http://onceupon.github.io/Bash-
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## Terminal Tricks
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##### Ctrl
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##### Using Ctrl keys
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```
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Ctrl + n : same as Down arrow.
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Ctrl + p : same as Up arrow.
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@ -111,6 +111,7 @@ egrep = grep -E # Extended Regular Expression (ERE)
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pgrep = grep -P # Perl Compatible Regular Expressions (PCRE)
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rgrep = grep -r # recursive
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```
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##### Grep and count number of empty lines
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```bash
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grep -c "^$"
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@ -162,7 +163,7 @@ grep -C 3 'bbo'
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grep -o 'S.*'
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```
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##### Extract text between words (e.g. w1,w2)
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##### Extract text between words (e.g. w1,w2)
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```bash
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grep -o -P '(?<=w1).*(?=w2)'
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```
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@ -180,8 +181,8 @@ grep -v '^#' file.txt
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##### Grep variables with space within it (e.g. bbo="some strings")
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```bash
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grep "$boo" filename
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```
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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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```bash
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@ -225,7 +226,6 @@ grep -rh bbo /path/to/directory
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grep -rl bbo /path/to/directory
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```
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##### Grep OR (e.g. A or B or C or D)
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```
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grep 'A\|B\|C\|D'
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@ -240,6 +240,7 @@ grep 'A.*B'
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```bash
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grep 'A.B'
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```
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##### Regex with or without a certain character (e.g. color or colour)
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```bash
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grep ‘colou?r’
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@ -905,20 +906,20 @@ esac
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## Variable
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[[back to top](#handy-bash-oneliner-commands)]
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##### variable substitution within quotes
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##### Variable substitution within quotes
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```bash
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# foo=bar
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echo "'$foo'"
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#'bar'
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# double/single quotes around single quotes make the inner single quotes expand variables
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```
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##### get the length of variable
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##### Get the length of variable
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```bash
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var="some string"
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echo ${#var}
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# 11
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```
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##### get the first character of the variable
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##### Get the first character of the variable
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```bash
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var=string
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echo "${var:0:1}"
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@ -928,26 +929,26 @@ echo "${var:0:1}"
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echo ${var%%"${var#?}"}
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```
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##### remove the first or last string from variable
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##### Remove the first or last string from variable
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```bash
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var="some string"
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echo ${var:2}
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#me string
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```
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##### replacement (e.g. remove the first leading 0 )
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##### Replacement (e.g. remove the first leading 0 )
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```bash
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var="0050"
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echo ${var[@]#0}
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#050
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```
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##### replacement (e.g. replace 'a' with ',')
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##### Replacement (e.g. replace 'a' with ',')
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```bash
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{var/a/,}
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```
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##### replace all (e.g. replace all 'a' with ',')
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##### Replace all (e.g. replace all 'a' with ',')
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```bash
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{var//a/,}
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```
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@ -1618,7 +1619,7 @@ gsettings set org.gnome.gedit.preferences.editor editor-font 'Cantarell Regular
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sudo gpasswd -a nice docker
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```
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##### pip install python package without root
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##### Pip install python package without root
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```bash
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1. pip install --user package_name
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2. You might need to export ~/.local/bin/ to PATH: export PATH=$PATH:~/.local/bin/
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@ -1671,7 +1672,7 @@ killall pulseaudio
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killall pulseaudio
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```
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##### List information about SCSI devices
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##### List information about SCSI devices
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```bash
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lsscsi
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```
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@ -2092,7 +2093,7 @@ echo 'heres the content'| mail -a /path/to/attach_file.txt -s 'mail.subject' me@
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# use -a flag to set send from (-a "From: some@mail.tld")
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```
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##### .xls to csv
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##### Convert .xls to csv
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```bash
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xls2csv filename
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```
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@ -2569,12 +2570,12 @@ Press q to quit scroll mode.
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cat filename|rev|cut -f1|rev
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```
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##### pass password to ssh
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##### Pass password to ssh
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```bash
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sshpass -p mypassword ssh root@10.102.14.88 "df -h"
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```
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##### wait for a pid (job) to complete
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##### Wait for a pid (job) to complete
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```bash
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wait %1
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# or
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@ -2583,13 +2584,13 @@ wait ${!}
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#wait ${!} to wait till the last background process ($! is the PID of the last background process)
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```
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##### pdf to txt
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##### Convert pdf to txt
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```bash
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sudo apt-get install poppler-utils
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pdftotext example.pdf example.txt
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```
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##### list only directory
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##### List only directory
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```bash
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ls -ld -- */
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```
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@ -2616,7 +2617,7 @@ tree
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#
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```
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##### set up virtualenv(sandbox) for python
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##### Set up virtualenv(sandbox) for python
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```bash
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# 1. install virtualenv.
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sudo apt-get install virtualenv
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