I know the time functions but I want to store the time command output in to a variable.
The time command output is printed in STDERR.
How can I store the output in to a variable, you have any idea?
--$ugum@r--
| [reply] |
The output of time is printed to STDERR, but after all the redirections are performed. Therefore, to capture it, you have to start time in a subshell. This has nothing to do with perl, though.
perl -e '$a=`(time ls) 2>&1 >/dev/null`;print "[$a]"'
| [reply]
[d/l] |
In addition to what you said, there's also the problem that the
output the OP wants likely is from the bash builtin "time".
Perl, however, is typically configured to call /bin/sh as the
default shell (see perl -V:sh). And as sh doesn't know
the time builtin (even if /bin/sh is just a link to /bin/bash
— for compatibility reasons, the program name is what
matters here), the shell will search for an external executable "time",
which usually is /usr/bin/time. The latter produces a different
output format, though.
To sum up, what the OP probably wants is
my $times = `/bin/bash -c "(time ls) 2>&1 >/dev/null"`;
Compare
#!/usr/bin/perl -l
$times = `(time ls) 2>&1 >/dev/null`;
print "/usr/bin/time:\n[$times]";
$times = `/bin/bash -c "(time ls) 2>&1 >/dev/null"`;
print "bash builtin:\n[$times]";
__END__
/usr/bin/time:
[0.00user 0.00system 0:00.00elapsed 114%CPU (0avgtext+0avgdata 0maxres
+ident)k
0inputs+0outputs (0major+396minor)pagefaults 0swaps
]
bash builtin:
[
real 0m0.008s
user 0m0.004s
sys 0m0.004s
]
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[d/l]
[select] |
| [reply] |
please do not write your reply inside the signature divs
I agree. In fact, some Monks completely filter out signature divs, as described in Signatures and Node Templates. For those Monks, the OP's postings appear to have no content.
| [reply] |