BashFAQ - Greg's Wiki
Note: The FAQ was split into individual pages for easier editing. Also, for faster loading of this page, the answers are no longer presented here in their entirety. Readers, click the [BashFAQ/nnn] link at the bottom of each answer to read the rest of the answer. Editors, click the '[edit]' link at the bottom of each entry. Don't add new ones to this page; create a new subpage with the next availa
EnglishFrontPage - Greg's Wiki
Greg's Wiki This is Greg's (also known as GreyCat's) wiki. It has some pages of interest to people doing Unix shell scripting or system administration. The official front page URLs are https://mywiki.wooledge.org/ or http://mywiki.wooledge.org/ . BashFAQ is the 'official' channel FAQ for libera's #bash IRC channel. For common mistakes made by Bash programmers, see BashPitfalls. For learning Bash,
BashFAQ/105 - Greg's Wiki
Why doesn't set -e (or set -o errexit, or trap ERR) do what I expected? set -e was an attempt to add "automatic error detection" to the shell. Its goal was to cause the shell to abort any time an error occurred, so you don't have to put || exit 1 after each important command. This does not work well in practice. The goal of automatic error detection is a noble one, but it requires the ability to t
BashFAQ/031 - Greg's Wiki
What is the difference between test, [ and [[ ? The open square bracket [ command (aka test command) and the [[ ... ]] test construct are used to evaluate expressions. [[ ... ]] works only in the Korn shell (where it originates), Bash, Zsh, and recent versions of Yash and busybox sh (if enabled at compilation time, and still very limited there especially in the hush-based variant), and is more pow
Bashism - Greg's Wiki
How to make bash scripts work in dash This page is an attempt to list some of the most common bashisms, i.e. features not defined by POSIX (won't work in dash, or general /bin/sh). It probably won't be exhaustive. Note also we talk about "bashism" because this wiki is largely bash-centric but a number (almost all) of these extensions work in at least some other shells like ksh or zsh with perhaps
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