Shell Programming and Scripting

HISTTIMEFORMAT="%d/%m/%y %T "

#!/usr/bin/env bash

# @(#) s1	Demonstrate bash history in script.

pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C

set -o history
pl " Results from history in script, first call."
echo " Hello, world from bash."

HISTTIMEFORMAT="%d/%m/%y %T "
history

pl " Results from history in script, second call."
echo " another Hello, world from bash."
history

exit 0

$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
bash GNU bash 3.2.39

-----
 Results from history in script, first call.
 Hello, world from bash.
    1  23/09/13 06:09:08 pl " Results from history in script, first call."
    2  23/09/13 06:09:08 echo " Hello, world from bash."
    3  23/09/13 06:09:08 HISTTIMEFORMAT="%d/%m/%y %T "
    4  23/09/13 06:09:08 history

-----
 Results from history in script, second call.
 another Hello, world from bash.
    1  23/09/13 06:09:08 pl " Results from history in script, first call."
    2  23/09/13 06:09:08 echo " Hello, world from bash."
    3  23/09/13 06:09:08 HISTTIMEFORMAT="%d/%m/%y %T "
    4  23/09/13 06:09:08 history
    5  23/09/13 06:09:08 pl " Results from history in script, second call."
    6  23/09/13 06:09:08 echo " another Hello, world from bash."
    7  23/09/13 06:09:08 history