I'd like to write a bash script myscript such that issuing this command:
myscript > filename.txt
would return the name of the filename that it's output is being redirected to, filename.txt. Is this possible?
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1No, the script does not have access to that information.Paul Tomblin– Paul Tomblin2012-08-24 16:32:20 +00:00Commented Aug 24, 2012 at 16:32
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2 Answers
If you are running on Linux, check where /proc/self/fd/1 links to.
For example, the script can do the following:
#!/bin/bash
readlink /proc/self/fd/1
And then run it:
$ ./myscript > filename.txt
$ cat filename.txt
/tmp/filename.txt
Note that if you want to save the value of the output file to a variable or something, you can't use /proc/self since it will be different in the subshell, but you can still use $$:
outputfile=$(readlink /proc/$$/fd/1)
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jeffvenuti
I'm guessing this would be a bit faster than the lsof approach since it doesn't have to spawn awk.
Using lsof:
outfile=$(lsof -p $$ | awk '/1w/{print $NF}')
echo $outfile
