Le Sun, Mar 08, 2026 at 06:14:32PM -0400, Greg Wooledge a écrit :
> On Sun, Mar 08, 2026 at 15:54:06 -0600, Stan Marsh wrote:
> > >When a shell script is edited while running, it appears the current
> > >invocation takes the update right away.
> It would be the work of a few minutes to come up with an example.
> A lot longer to come up with a *good* example.
Running this:
#!/bin/bash
echo "This is a test script"
script="$(sed \$s/last/second-to-last/ <$0)"
echo "$script" >$0
echo 'echo This line was added while running' >>$0
echo This is the last line.
could produce something like:
This is a test script
This is the last line.
./script.sh: line 11: ast: command not found
This line was added while running
By adding a ``sync'' command:
#!/bin/bash
echo "This is a test script"
script="$(sed \$s/last/second-to-last/ <$0)"
echo "$script" >$0
sync
echo 'echo This line was added while running' >>$0
echo This is the last line.
I will read:
This is a test script
This is the second-to-last line.
This line was added while running
But as Greg said,
> It's a well-known pitfall, in any case.
--
Félix Hauri - <[email protected]> - http://www.f-hauri.ch
