Item: No environment variable or other easy means is currently
available to pass the complete command line to daughter scripts and
programs.
Maybe this is a feature request rather than a bug per se, but I'd
appreciate those who know better than me bearing with me (I'm happy
to hear suggestions where else I might send this).
I am trying (badly!) to find a means that any program or script can
obtain the command line that invoked it as a string. I want to avoid
hacks that rely on the user remembering anything like pre-pending the
command line by setting an environment variable (ugly,
untrustworthy). This is *not* the program/script name and its
arguments, but the complete command line, including any pipes,
redirects, etc. For example, I want do_stuff to be able to get the
complete command line that evoked it:
echo -n "Saving.." ; more some_stuff | \
do_stuff -D first_*.lst second_*.lst > save_here &
and through this record that the output went to "save_here" and that
the original input of save_here was first_*.lst and second_*.lst, for
example.
It seems to me that a lack of an easy way of doing this leaves
something rather useful missing. (That, or I'm badly missing
something! -- in which case if anyone can suggest an existing way of
doing this, I'd be most grateful. If you can reply directly that'd be
a help as I've yet to locate the mailing list reigstration
instructions, etc.!).
A couple of environment variables holding the current unprocessed and
shell-processed command lines that are set by the shell for each new
command line before its evoked would be ideal and surely not
especially hard to implement (?).
Another generic solution might be an equivalent to PROMPT_COMMAND
that is evoked before each line, i.e. NEWLINE_COMMAND, although this
raises a few questions. The user could then place something like:
NEWLINE_COMMAND="THISCMD=`history 1`"
export THISCMD
into their .bash_profile to have THISCMD set up before each line is
executed. This could be extended to cover a variety of signal events
within the bash shell.
Grant
[gjacobs:gjacobs] bash --version
GNU bash, version 2.05b.0(1)-release (powerpc-apple-darwin7.0)
Copyright (C) 2002 Free Software Foundation, Inc.
(No bugbash on OSX bash, at least by default; same version of bash on
darwin8.0, too.)
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Bioinformatics tools: deriving knowledge from biological data
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