Terminal · Expert

Lesson 1 · On the house

Process substitution

Feed command output as a file with <( ) and >( ).

Lesson 2

Advanced redirects and /dev/fd

Duplicate FDs, merge streams, and name /dev/fd paths.

Lesson 3

trap and EXIT cleanup

Run handlers on signals and shell exit.

Lesson 4

Associative arrays and namerefs

declare -A maps and declare -n aliases.

Lesson 5

Jobs, wait, and coproc

Background control, wait, and a bash coproc sketch.

Lesson 6

Strict mode and ERR/xtrace

set -euo pipefail, ERR traps, and set -x.

Lesson 7

awk glue for pipelines

Field math and filters awk does better than cut.

Lesson 8

Parameter expansion and =~

${var%%pat}, defaults, and [[ =~ ]] regex.

Lesson 9

Secure scripting habits

Quote, IFS, mktemp, and tight permissions.

Lesson 10

Expert capstone

Strict script: tempdir, awk glue, jobs, cleanup.