Obtaining complete Unix command line that evoked script as string
- From: gjacobs@xxxxxxxxxxxxxxxx (Grant Jacobs)
- Date: Tue, 10 Jan 2006 23:40:44 +1300
Item: Obtaining complete Unix command line that evoked script as a string
If there is a more appropriate list for this, let me know; the other perl lists I've seen seem to specialised for this.
I'm trying to get the complete command line that invoked a script as a string, that is the output of 'history 1'. Note this is not just the arguments of the call to the script, but everything including pipes and redirects, etc., e.g.
echo -n "Starting..." ; more some-stuff | \
doStuff.pl - 3 > save-here.out ; echo "done."Ideally the perl interpreter would grab the complete command line as its evoked and I'd access this via a variable. As this seem problematic, more realistically, ideally the shell should maintain a "current command" variable in the same fashion as the CWD variable, which can then be exported and read. AFAIK this does exist... (I see at the bottom of the bash FAQ that better environment variable support of perl is on hopeful feature to be added... one day; I'd very much like to see this.)
So... any ideas on something that does work, or am I just plain stuck?
I'm using the bash shell for what its worth. This may appear to be a bash question, but I'm hoping for a perlish solution if possible!
You can achieve this in an ugly unreliable fashion by having the caller set up an environment variable and read this in within the scripts, e.g.
THISCMD=`history 1` ; doStuff.pl first-time
(and have doStuff read in $THISCMD)
But if the caller doesn't set up the environment variable on any given command line, the previous value is used which is plain wrong. Basically its untrustworthy, defeating my purpose for this, and there doesn't seem to be any particularly easy way to make it trustworthy. In any event, its also plain ugly!
Using bash's PROMPT_COMMAND to clear the value doesn't help, as this doesn't apply if the command lines are within a non-interactive script.
Grant
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