Fix shell script in ulimit.txt

[48763]

STAGING

Fix process_pids empty

Command ps -C $process -o pid --no-headers output prefix has 4 spaces on ubuntu 20.04 (older version had only 1 spaces), so the argument process_pids will empty in shell script.

Modify cut -d " " -f 2 to grep -oP "[[:digit:]]*", can solve this problem, and makes both versions compatible.

Fix operator expected

If using multiple arguments, will cause problem and shows following error message:

$ return-limits mongod mongos
-bash: [: mongod: binary operator expected
-bash: [: mongod: binary operator expected

The argument $@ should be changed to process_pids In the if conditional expressions, which can solve the problem and be more actual.

JIRA

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