530 = and == are for string comparisons -eq is for numeric comparisons -eq is in the same family as -lt, -le, -gt, -ge, and -ne == is specific to bash (not present in sh (Bourne shell), ...). Using …

#!/bin/bash # To focus exclusively on the performance of each type of increment # statement, we should exclude bash performing while loops from the # performance measure.

I spend most of my time working in Unix environments and using terminal emulators. I try to use color on the command line, because color makes the output more useful and intuitive. What …

74 As per bash - The Set Builtin manual, if -e / errexit is set, the shell exits immediately if a pipeline consisting of a single simple command, a list or a compound command returns a non …

The shell command and any arguments to that command appear as numbered shell variables: $0 has the string value of the command itself, something like script, ./script, /home/user/bin/script …

36 All of the bash completions are stored in /etc/bash_completion.d/. So if you're building software with bash_completion it would be worthwhile to have the deb/make install drop a file with the …

Modern shells such as Bash and Zsh have inherited this construct from Ksh, but it is not part of the POSIX specification. If you're in an environment where you have to be strictly POSIX …

A shell assignment is a single word, with no space after the equal sign. So what you wrote assigns an empty value to thefile; furthermore, since the assignment is grouped with a …

In any case, bash always supports tilde expansion and the point of .bash_profile is that only bash runs commands from it, so . ~/.profile is fine.) The . builtin sources a file, which is to say it runs …

Under bash and some other shell, you could use parameter expansion to quickly transform your string to lower or upper case, by using respectively: ${var,,} and ${var^^}: