How to determine whether a command is running or not from bash
I want to re-run a file php every time it ends...
Then I have created i file SH like this
VAR_1=1;
while [[ $VAR_1 != "2" ]]; do
for filename in *.php; do
if [ -- check if command is NOT running -- ]; then
sleep .5
php $filename
fi
done
done
What kind of IF i must use ?
command-line bash
asked 8 hours ago
FireFoxIIFireFoxII
1083
add a comment |
I want to re-run a file php every time it ends...
Then I have created i file SH like this
VAR_1=1;
while [[ $VAR_1 != "2" ]]; do
for filename in *.php; do
if [ -- check if command is NOT running -- ]; then
sleep .5
php $filename
fi
done
done
What kind of IF i must use ?
command-line bash
asked 8 hours ago
FireFoxIIFireFoxII
1083
What is the output of the php process? Use that to determine when to re-run that file!
– George Udosen
8 hours ago
add a comment |
I want to re-run a file php every time it ends...
Then I have created i file SH like this
VAR_1=1;
while [[ $VAR_1 != "2" ]]; do
for filename in *.php; do
if [ -- check if command is NOT running -- ]; then
sleep .5
php $filename
fi
done
done
What kind of IF i must use ?
command-line bash
asked 8 hours ago
FireFoxIIFireFoxII
1083
I want to re-run a file php every time it ends...
Then I have created i file SH like this
VAR_1=1;
while [[ $VAR_1 != "2" ]]; do
for filename in *.php; do
if [ -- check if command is NOT running -- ]; then
sleep .5
php $filename
fi
done
done
What kind of IF i must use ?
command-line bash
command-line bash
asked 8 hours ago
FireFoxIIFireFoxII
1083
asked 8 hours ago
FireFoxIIFireFoxII
1083
asked 8 hours ago
FireFoxIIFireFoxII
1083
asked 8 hours ago
FireFoxIIFireFoxII
1083
asked 8 hours ago
FireFoxIIFireFoxII
1083
1083
What is the output of the php process? Use that to determine when to re-run that file!
– George Udosen
8 hours ago
add a comment |
What is the output of the php process? Use that to determine when to re-run that file!
– George Udosen
8 hours ago
What is the output of the php process? Use that to determine when to re-run that file!
– George Udosen
8 hours ago
What is the output of the php process? Use that to determine when to re-run that file!
– George Udosen
8 hours ago
add a comment |
2 Answers
2
active
oldest
votes
( readlink /proc/*/exe | grep -q '/path/to/the/command' )
Will return 0 if a process is running /path/to/the/command.
However, the canonical way to do this is a bit different:
- On startup, the process checks if some known file (typically
/run/$commandname.pid) exists - If so, it reads the PID in it, and check if said process is still running (for instance, there is a
/proc/$pid/directory) - If yes, it exits
- Otherwise (no PID file, or process no longer running), it writes its own PID in the file and starts.
answered 7 hours ago
xenoidxenoid
1,7531416
add a comment |
use pgrep
if ! pgrep -f "php $filename"; then echo "command not running"; fi
However, "I want to re-run a file php every time it ends", so why don't you just do this:
while true; do
php "$filename"
done
Then you don't have to search for it, when it ends it will just run again.
answered 6 hours ago
glenn jackmanglenn jackman
12.5k2545
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
( readlink /proc/*/exe | grep -q '/path/to/the/command' )
Will return 0 if a process is running /path/to/the/command.
However, the canonical way to do this is a bit different:
- On startup, the process checks if some known file (typically
/run/$commandname.pid) exists - If so, it reads the PID in it, and check if said process is still running (for instance, there is a
/proc/$pid/directory) - If yes, it exits
- Otherwise (no PID file, or process no longer running), it writes its own PID in the file and starts.
answered 7 hours ago
xenoidxenoid
1,7531416
add a comment |
( readlink /proc/*/exe | grep -q '/path/to/the/command' )
Will return 0 if a process is running /path/to/the/command.
However, the canonical way to do this is a bit different:
- On startup, the process checks if some known file (typically
/run/$commandname.pid) exists - If so, it reads the PID in it, and check if said process is still running (for instance, there is a
/proc/$pid/directory) - If yes, it exits
- Otherwise (no PID file, or process no longer running), it writes its own PID in the file and starts.
answered 7 hours ago
xenoidxenoid
1,7531416
add a comment |
( readlink /proc/*/exe | grep -q '/path/to/the/command' )
Will return 0 if a process is running /path/to/the/command.
However, the canonical way to do this is a bit different:
- On startup, the process checks if some known file (typically
/run/$commandname.pid) exists - If so, it reads the PID in it, and check if said process is still running (for instance, there is a
/proc/$pid/directory) - If yes, it exits
- Otherwise (no PID file, or process no longer running), it writes its own PID in the file and starts.
answered 7 hours ago
xenoidxenoid
1,7531416
( readlink /proc/*/exe | grep -q '/path/to/the/command' )
Will return 0 if a process is running /path/to/the/command.
However, the canonical way to do this is a bit different:
- On startup, the process checks if some known file (typically
/run/$commandname.pid) exists - If so, it reads the PID in it, and check if said process is still running (for instance, there is a
/proc/$pid/directory) - If yes, it exits
- Otherwise (no PID file, or process no longer running), it writes its own PID in the file and starts.
answered 7 hours ago
xenoidxenoid
1,7531416
answered 7 hours ago
xenoidxenoid
1,7531416
answered 7 hours ago
xenoidxenoid
1,7531416
answered 7 hours ago
xenoidxenoid
1,7531416
1,7531416
add a comment |
add a comment |
use pgrep
if ! pgrep -f "php $filename"; then echo "command not running"; fi
However, "I want to re-run a file php every time it ends", so why don't you just do this:
while true; do
php "$filename"
done
Then you don't have to search for it, when it ends it will just run again.
answered 6 hours ago
glenn jackmanglenn jackman
12.5k2545
add a comment |
use pgrep
if ! pgrep -f "php $filename"; then echo "command not running"; fi
However, "I want to re-run a file php every time it ends", so why don't you just do this:
while true; do
php "$filename"
done
Then you don't have to search for it, when it ends it will just run again.
answered 6 hours ago
glenn jackmanglenn jackman
12.5k2545
add a comment |
use pgrep
if ! pgrep -f "php $filename"; then echo "command not running"; fi
However, "I want to re-run a file php every time it ends", so why don't you just do this:
while true; do
php "$filename"
done
Then you don't have to search for it, when it ends it will just run again.
answered 6 hours ago
glenn jackmanglenn jackman
12.5k2545
use pgrep
if ! pgrep -f "php $filename"; then echo "command not running"; fi
However, "I want to re-run a file php every time it ends", so why don't you just do this:
while true; do
php "$filename"
done
Then you don't have to search for it, when it ends it will just run again.
answered 6 hours ago
glenn jackmanglenn jackman
12.5k2545
answered 6 hours ago
glenn jackmanglenn jackman
12.5k2545
answered 6 hours ago
glenn jackmanglenn jackman
12.5k2545
answered 6 hours ago
glenn jackmanglenn jackman
12.5k2545
12.5k2545
add a comment |
add a comment |
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What is the output of the php process? Use that to determine when to re-run that file!
– George Udosen
8 hours ago