bash - What are the special dollar sign shell variables ... - Stack ...
Sep 14, 2012 · In Bash, there appear to be several variables which hold special, consistently-meaning values. For instance, ./myprogram &; echo $! will return the PID of the process …
bash - What does <<< mean? - Unix & Linux Stack Exchange
Take a look at the Bash man page. This notation is part of what's called a here documents & here strings. It allows you the ability to generate multi-line data input as one continuous string. The …
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 …
Meaning of $? (dollar question mark) in shell scripts
Aug 1, 2019 · What does echo $? mean in shell programming?This is the exit status of the last executed command. For example the command true always returns a status of 0 and false …
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?
An "and" operator for an "if" statement in Bash - Stack Overflow
An "and" operator for an "if" statement in Bash Asked 12 years, 11 months ago Modified 1 year, 3 months ago Viewed 987k times
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 …
shell - What does "-ne" mean in bash? - Stack Overflow
Jul 17, 2013 · It doesn't mean anything "in bash". [ runs a command called test. -ne is an argument to the test command, not to bash, and you can find its documentation in man test.
How to highlight bash/shell commands in markdown?
sh, bash, zsh, fish, ksh and so on for the content of a script so usually commands with the internal syntax of the shell language. shell or similar for CLI commands, highlighting with different …
What is the difference between single and double square brackets …
Nov 24, 2012 · The team from [email protected], that manage bash FAQ, Greg wiki, bash-hackers and shellcheck.net Anyway replaced we by I.