Public bug reported:
If a command line is really long and the search term is toward the end
of it, pgrep -f fails to find the process. Experimentally, it appears
that the magic number is about 4084.
The script below reproduces the problem. If the command line is short,
pgrep -f reports both a sleep and a bash process. If the line is too
long, pgrep -f only reports the sleep process.
# pgrep -f fails if >= 4063, succeeds if < 4063
stringLength=4063
reallyLongString=$(cat /dev/urandom | tr -cd '[:alnum:]' | head -c
$stringLength)
bash -c "echo $reallyLongString > /dev/null ; sleep 999" 2> /dev/null&
pid=$!
sleep 1
echo no -f:
pgrep -l sleep
echo with -f:
pgrep -fl sleep
pkill sleep
** Affects: procps (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1758087
Title:
pgrep -f fails for long command lines
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