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Re^3: Capturing bash output without displaying STOUT in terminal

by stevieb (Canon)
on Sep 08, 2016 at 16:18 UTC ( [id://1171413]=note: print w/replies, xml ) Need Help??


in reply to Re^2: Capturing bash output without displaying STOUT in terminal
in thread Capturing bash output without displaying STOUT in terminal

What is the output on screen you get?

Try running something you know won't error out and write to STDERR instead of STDOUT. For instance:

my $out = `ls`;

...should NOT write to STDERR. If that works, but your original command doesn't, I'm pretty certain that something is happening that is writing to STDERR.

Try doing a git status with backticks and see what happens. Now move the test to a non-repo directory and compare the results (the latter will print to console, the former won't).

Replies are listed 'Best First'.
Re^4: Capturing bash output without displaying STOUT in terminal
by Linicks (Scribe) on Sep 08, 2016 at 17:16 UTC

    I tried this, and it doesn't work for 'git fetch --tags' for some reason.

    My guess is that using this command produces some sort of 'active' output (for want of a better description) in the terminal, and it isn't a static output like you would get from backticks 'ls' or 'ps ax' etc.

    Now for some reason, once you run 'git fetch --tags', any other time you run it, there is no output - I don't know how to reset it to test - but maybe try saving the command in a text file chmod 755 gitfetch.sh and then use

    my $git = `.\gitfetch.sh`;

    BTW, using 'my $git = `git status`; works:

    :~/git/claws/claws$ perl gittest What's here? --- On branch master Your branch is up-to-date with 'origin/master'. Untracked files: (use "git add <file>..." to include in what will be committed) gittest nothing added to commit but untracked files present (use "git add" to +track)

    Nick

      OK, first I had to suss out git to clear tags so I could test:

      git tag -d $(git tag)

      does it.

      Now, as assumed, output goes somewhere else, so:

      #!/usr/bin/perl use warnings; use strict; my $git; $git = `git fetch --tags 2>&1`; print "What's here? --- $git\n";

      sorts it.

      Nick

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