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Feat: Default PID

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Make the pid parameter default to the PID of the current process.

Change the exit code for invalid arguments to a value in the user
defined range (see https://tldp.org/LDP/abs/html/exitcodes.html). This
may be considered a breaking change, but since the only applications
that currently use this script don't rely on this code, I don't think
we need to bump the major version for this.
This commit is contained in:
Narvin Singh 2021-01-04 14:47:13 -05:00
parent f2bdd47bec
commit 1516ff1550
1 changed files with 6 additions and 5 deletions
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rpid
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@ -3,7 +3,8 @@
USAGE=' USAGE='
USAGE: rpid <pid|-h|-[-]help> [<root_name>=login] USAGE: rpid <pid|-h|-[-]help> [<root_name>=login]
pid The PID of the process for which you want to find the root PID. pid The PID of the process for which you want to find the root
PID. Defaults to $$.
root_name root_name
The name (not command line) of the root process, for which The name (not command line) of the root process, for which
@ -20,16 +21,16 @@ EXAMPLES:
Get the PID of the login process that is the ancestor of the current Get the PID of the login process that is the ancestor of the current
process. process.
rpid $$ rpid
' '
# Validate the arguments # Validate the arguments
if [[ "$#" -lt 1 || "$#" -gt 2 ]]; then if [[ "$#" -gt 2 ]]; then
printf '%s' "${USAGE}" 1>&2 printf '%s' "${USAGE}" 1>&2
exit 128 exit 64
fi fi
pid="$1" pid="${1:-$$}"
# Check if the user needs help # Check if the user needs help
if [[ "${pid}" =~ ^(-h|-(-)?help)$ ]]; then if [[ "${pid}" =~ ^(-h|-(-)?help)$ ]]; then