blob: 92d4b7a3ca71e6694c6f9153ce1b9450cf7f9ac8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
#!/bin/sh
#
# Find the PID of a command and wait until it changes.
#
# Aaron LI
# 2018-04-01
#
self="$0"
getpid() {
pattern="$1"
output=$(ps auxww | grep "${pattern}" | grep -v grep | grep -v ${self})
lines=$(echo "${output}" | wc -l)
if [ ${lines} -gt 1 ]; then
echo "Error: multiple processes matching the pattern: '${pattern}'" >&2
echo
echo "${output}" >&2
exit 2
elif [ -z "${output}" ]; then
echo "Error: no processes matching the pattern: '${pattern}'" >&2
exit 3
fi
echo "${output}" | awk '{ print $2 }'
}
usage() {
echo "usage: ${self##*/} [-h] [-d delay] <pattern>"
exit 1
}
while getopts :d:h opt; do
case "${opt}" in
d)
delay=${OPTARG}
;;
h)
usage
;;
\?)
echo "Invalid option -${OPTARG}" >&2
usage
;;
:)
echo "Option -${OPTARG} requires an argument" >&2
usage
;;
esac
done
shift $((OPTIND - 1))
[ $# -ne 1 ] && usage
delay=${delay:-5} # [second]
pattern="$1"
pid=$(getpid "${pattern}") || exit $?
echo "Process ${pid} matches pattern: '${pattern}'"
echo -n "waiting for pid change ..."
sleep ${delay}
while pid2=$(getpid "${pattern}"); do
[ ${pid2} -ne ${pid} ] && {
echo "changed!"; exit 0
}
echo -n "."
sleep ${delay}
done
exit $?
|
