bash - Shell equality operators (=, ==, -eq) - Stack Overflow
It depends on the Test Construct around the operator. Your options are double parentheses, double brackets, single brackets, or test. If you use ((…)), you are testing arithmetic equality …
An "and" operator for an "if" statement in Bash - Stack Overflow
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 …
What do the -n and -a options do in a bash if statement?
The switches -a and -n are not strictly part of a bash if statement in that the if command does not process these switches. What are primaries? I call them "switches", but the bash …
How do I iterate over a range of numbers defined by variables in …
Oct 4, 2008 · Related discusions: bash for loop: a range of numbers and unix.stackexchange.com - In bash, is it possible to use an integer variable in the loop control of a for loop?
sh - [: missing `]' in bash script - Stack Overflow
Feb 9, 2016 · The double-brace keyword is a bash expression, and will not work with other POSIX shells, but it has some benefits, as well, such as being able to do these kinds of operations …
How to compare strings in Bash - Stack Overflow
Feb 10, 2010 · How do I compare a variable to a string (and do something if they match)?
syntax - Ternary operator (?:) in Bash - Stack Overflow
@dutCh's answer shows that bash does have something similar to the "ternary operator" however in bash this is called the "conditional operator" expr?expr:expr (see man bash goto section …
What does 'set -e' mean in a Bash script? - Stack Overflow
By default, Bash does not do this. This default behavior is exactly what you want if you are using Bash on the command line you don't want a typo to log you out! But in a script, you really want …
Shell scripting: -z and -n options with if - Unix & Linux Stack …
Jan 16, 2014 · You can find a very nice reference for bash's [ aka test builtin's operators here, or by running help test in a bash shell or info bash test or info bash '[' from any shell¹. If you are …
bash - How to escape single quotes within single quoted strings
Aug 9, 2009 · Instead, try printf, or perhaps regular echo with Bash's $'c-style' strings which support basically the same escapes (so \047 encodes an escaped literal single quote).