bash: add 2command.sh script

bash/.gitignore

@@ -0,0 +1 @@
+/2command.txt

bash/README.md

@@ -12,6 +12,7 @@ If you create additional `~/.bashrc.d/*` or `~/.profile.d/*` files, they will al
 
 ## Scripts
 
+- [`2command.sh`](scripts/2command.sh) - display a menu of commands to select to run from `bash/2command.txt`, one per line
 - [`2link.sh`](scripts/2link.sh) - create relative symlinks to files or directories from given directory
 - [`2path.sh`](scripts/2path.sh) - create symlinks to files or directories from `~/.local/bin`, giving unique names to directories
 - [`syncfiles.sh`](scripts/syncfiles.sh) - given paths to two or more files, prompt to copy the newest one over each of the ones it differs from

bash/scripts/2command.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+dir="$(dirname "$(dirname "$(readlink --canonicalize "$0")")")"
+awk '{print FNR ") " $0}' "$dir"/2command.txt
+printf 'Selection: '
+if [ "$1" ]; then num="$1"; echo "$num"; else read num; fi
+{ [ "$num" -ge 1 ] && [ "$num" -le $(cat "$dir"/2command.txt | wc --lines) ]; } 2> /dev/null || exit 1
+cmd="$(tail --lines=+$num "$dir"/2command.txt | head --lines=1)"
+echo "$num) $cmd"
+eval "$cmd"