I'm trying to learn shell scripting, and I need to understand someone else's code. What is the $? variable hold? I can't Google search the answer because they block punctuation characters.

Shell equality operators (=, ==, -eq) Asked 11 years, 10 months ago Modified 3 years, 4 months ago Viewed 644k times

Here shell is an alias for bash. Chroma has something called Session. Pygments (doc) uses console, shell-session for bash sessions, pwsh-session, ps1con for power shell sessions and …

Feb 20, 2011 · When going through one shell script, I saw the term "$?". What is the significance of this term?

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I want to redirect both standard output and standard error of a process to a single file. How do I do that in Bash?

In shell programming, commands and arguments must be separated from each other by whitespace. Here, you see the equal sign with no whitespace, meaning this is a variable …

May 8, 2012 · I understand the basic difference between an interactive shell and a non-interactive shell. But what exactly differentiates a login shell from a non-login shell? Can you give …

I am writing a shell script to run under the KornShell (ksh) on AIX. I would like to use the mkdir command to create a directory. But the directory may already exist, in which case I do not …

The shell is the program which actually processes commands and returns output. Most shells also manage foreground and background processes, command history and command line editing.