Bash ScriptingVariables, tests and loops, plus the two lines to start every script.ComputingPOSIX-ish bash. Quoting rules are the whole game.Header#!/usr/bin/env bashset -euo pipefail-e exit on error-u error on unset variable-o pipefail catch errors in pipesVariablesname="value" – no spaces around ="$name" – always quote"${arr[@]}" – all array elements$(cmd) – command substitution"${1:-default}" – fallbackTests[[ -f file ]] – exists[[ -z "$x" ]] – empty[[ "$a" == "$b" ]](( n > 3 )) – arithmeticLoopsfor f in *.txt; do ... donewhile read -r line; do ... donecase "$x" in a) ;; esacUse [[ ]] rather than [ ]. It handles empty variables and does not need asmuch quoting inside.Bash Scriptinglearnposters.com
Bash Scripting — printable computing wall chart from LearnPosters. Free vector PDF, US Letter and A4.

What’s on the Bash Scripting poster

17 entries in 4 groups.

POSIX-ish bash. Quoting rules are the whole game.

Use [[ ]] rather than [ ]. It handles empty variables and does not need as much quoting inside.

Questions about the Bash Scripting poster

What’s on the Bash Scripting poster?
17 entries in 4 groups. POSIX-ish bash. Quoting rules are the whole game. Header: #!/usr/bin/env bash, set -euo pipefail, -e exit on error, -u error on unset v…; Variables: name="value" – no spaces around =, "$name" – always quote, "${arr[@]}" – a…; Tests: [[ -f file ]] – exists, [[ -z "$x" ]] – empty, [[ "$a" == "$b" ]], (( n > 3 ))…; Loops: for f in *.txt; do ... done, while read -r line; do ... done, case "$x" in a)…. Use [[ ]] rather than [ ]. It handles empty variables and does not need as much quoting inside.
Who is the Bash Scripting poster for?
Bash Scripting belongs to the Computing section rather than to a school year, because computing is not something one grade owns. Anyone learning languages can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the Bash Scripting poster?
Quote every variable. Unquoted expansion is the source of most shell bugs. A wall chart earns its place by being glanceable from where the work is happening, so Bash Scripting belongs on the wall where that computing work actually happens, within glancing distance, rather than filed away.
What other posters go with Bash Scripting?
REST API Design, Error Handling and Branching Models sit alongside Bash Scripting in the Computing section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.REST API DesignError HandlingBranching Models
Is the Bash Scripting poster free to download and print?
Yes. Bash Scripting downloads as a free PDF with no account, no email and no watermark, like everything else in the Computing section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Bash Scripting poster print at?
Bash Scripting is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Bash Scripting loses nothing.Printing guide

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