2
votes
1answer
88 views

BASH: alternatives to coproc [closed]

I have some scripts which use coproc to control stdout/stdin of subprocesses. Unfortunately, coproc was introduced in Bash 4.0, and on many systems I use, there is an earlier versions of bash. Are ...
3
votes
2answers
207 views

Should a foreground program invoked by a daemon split logging between stderr and stdout based on severity levels?

Usually log messages are written to stderr. I'm wondering if it is a good idea/practice to split log messages so that errors and warnings go to stderr while debug/informational/notice messages go to ...
0
votes
2answers
238 views

Unix wrapper to make any binary accept stdin/stdout redirection

This is a common situation: you want to include command 'foo' as part of a pipeline, but unfortunately command 'foo' only accepts actual filenames for I/O and does not read/write from stdin/stdout. I ...
2
votes
1answer
517 views

CentOS 5.3, Perl, bash commands, Hide ALL output to screen

I am running the following command: [user@server ~]$ /usr/sbin/ntpdate -d IPREMOVEDFORSECURITY | egrep 'transmit timestamp' | tail -1 | awk '{print $4, $5, $6, $7, $8}' host found : ...
0
votes
3answers
2k views

Suppress GPG “Reading passphrase from file descriptor 0” message

Simply, how can I make GPG not print that message? Here are the commands I'm using: echo "test input" > test.in echo "test" | gpg -q -c --passphrase-fd 0 --output test.enc --yes --force-mdc ...