Public bug reported:
Simple function gives different results when interpretator set in first string
of script
CHECKPROC()
{
i=$(ps aux | grep -c $0)
ps aux | grep -c $0
echo variable is $i
sleep 10
}
CHECKPROC
Expected
In any conditions it will return same values, then will increments when other
copies of script will be found in proccesses list.
Happened.
We set interpretator with #!/bin/bash or #!/bin/sh in first string of script
and runs multiple copies of script from one terminal with & after scriptname.
It's returns "1" and "variable is 1" always.
Without interpretator setup, when string #!/bin/bash or #!/bin/sh deleted.
Run multiple copies scriptname.sh&
On every iteration it returns right first value and "variable is $value+1"
$scriptname.sh&
2
variable is 3
$scriptname.sh&
3
variable is 4
...and so on.
Without counting in first case it returns only string with grep, in
second case -- one more string with different PID and script name when
called from i=$(...) or i=`...`
Ubuntu 14.04 x32, bash 4.3.11(1)-release
Same results from other man on
GNU bash, version 5.1.16(1)-release (aarch64-apple-darwin21.1.0)
GNU bash, version 4.4.20(1)-release (x86_64-pc-linux-gnu)
lsb_release -rd
Description: Ubuntu 14.04.6 LTS
Release: 14.04
apt-cache policy bash
bash:
Установлен: 4.3-7ubuntu1.7
Кандидат: 4.3-7ubuntu1.7
Таблица версий:
4.3-7ubuntu1.8+esm1 0
-32768 https://esm.ubuntu.com/ubuntu/ trusty-infra-security/main i386
Packages
*** 4.3-7ubuntu1.7 0
500 http://ru.archive.ubuntu.com/ubuntu/ trusty-updates/main i386
Packages
500 http://security.ubuntu.com/ubuntu/ trusty-security/main i386
Packages
100 /var/lib/dpkg/status
4.3-6ubuntu1 0
500 http://ru.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1958060
Title:
bash returns wrong variable value/call more proccesses?
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