Tag Archives: Linux

Parameter Details IFS Internal field separator-x Print commands and their arguments as they are executed (Shell option) What, when and Why? When the shell performs parameter expansion, command substitution, variable …

Parameter DetailsPATH Path environment variable Add a path to the PATH environment variable The PATH environment variable is generally defined in ~/.bashrc or ~/.bash_profile or /etc/profile or ~/.profile or/etc/bash.bashrc (distro …

Using |& |& connects standard output and standard error of the first command to the second one while | only connectsstandard output of the first command to the second command.In …

scp transferring file To transfer a file securely to another machine – type: scp file1.txt tom@server2:$HOME This example presents transferring file1.txt from our host to server2’s user tom’s home directory. …

.bash_profile, .bash_login, .bashrc, and .profile all do pretty much the same thing: set up and definefunctions, variables, and the sorts. The main difference is that .bashrc is called at the …

List background processes $ jobs [1] Running sleep 500 & (wd: ~) [2]- Running sleep 600 & (wd: ~) [3]+ Running ./Fritzing & First field shows the job ids. The …

Simple case statement In its simplest form supported by all versions of bash, case statement executes the case that matches the pattern. ;; operator breaks after the first match, if …

An overview of Bash’s internal variables, where, how, and when to use them. Bash internal variables at a glance VariableDetailsFunction/script positional parameters (arguments). Expand as follows$* / $@$* and $@ …

Find the current shell There are a few ways to determine the current shell echo $0 ps -p $$ echo $SHELL List available shells To list available login shells : …

Get captured groups from a regex match against a string a='I am a simple string with digits 1234' pat='(.*) ([0-9]+)' [[ "$a" =~ $pat ]] echo "${BASH_REMATCH[0]}" echo "${BASH_REMATCH[1]}" echo …