setsid: can't execute './test.sh': Exec format error
I tried to execute setsid ./test.sh command on Alpine OS in a docker container.
And it says 'Exec format error'. then I added a header bang '
#!/usr/bin/env bash' to that script. It works.
But the same command and script without header on centos6 works well.
I've digged into it deeply. Seems that setsid is a system call which use execvp to execute command, execvp will treat the script as an execute file.
My script.sh has execute permission and can run with './script.sh'. Why does the script behave differently on alpine and centos?
bash
asked Nov 12 at 12:33
Reminia Scarlet
11
add a comment |
I tried to execute setsid ./test.sh command on Alpine OS in a docker container.
And it says 'Exec format error'. then I added a header bang '
#!/usr/bin/env bash' to that script. It works.
But the same command and script without header on centos6 works well.
I've digged into it deeply. Seems that setsid is a system call which use execvp to execute command, execvp will treat the script as an execute file.
My script.sh has execute permission and can run with './script.sh'. Why does the script behave differently on alpine and centos?
bash
asked Nov 12 at 12:33
Reminia Scarlet
11
1
I would assume that alpine doesn't know that your script is a executable (it is just a text file after all). bash is the executable that runs the script - so your bang solves it, or you could run it like this: setsid bash test.sh. CentOs might be a bit more clever and knows what you want to do
– Milos Matovic
Nov 12 at 12:51
1
Note that while it may work on Centos, you don't really know ifbashis really the shell being run (in this case, it was most likely run by/bin/shinstead). Adding a shebang is considered best practice as this explicitely states which program should run your script
– Aserre
Nov 12 at 13:08
add a comment |
I tried to execute setsid ./test.sh command on Alpine OS in a docker container.
And it says 'Exec format error'. then I added a header bang '
#!/usr/bin/env bash' to that script. It works.
But the same command and script without header on centos6 works well.
I've digged into it deeply. Seems that setsid is a system call which use execvp to execute command, execvp will treat the script as an execute file.
My script.sh has execute permission and can run with './script.sh'. Why does the script behave differently on alpine and centos?
bash
asked Nov 12 at 12:33
Reminia Scarlet
11
I tried to execute setsid ./test.sh command on Alpine OS in a docker container.
And it says 'Exec format error'. then I added a header bang '
#!/usr/bin/env bash' to that script. It works.
But the same command and script without header on centos6 works well.
I've digged into it deeply. Seems that setsid is a system call which use execvp to execute command, execvp will treat the script as an execute file.
My script.sh has execute permission and can run with './script.sh'. Why does the script behave differently on alpine and centos?
bash
bash
asked Nov 12 at 12:33
Reminia Scarlet
11
asked Nov 12 at 12:33
Reminia Scarlet
11
asked Nov 12 at 12:33
Reminia Scarlet
11
asked Nov 12 at 12:33
Reminia Scarlet
11
asked Nov 12 at 12:33
Reminia Scarlet
11
11
1
I would assume that alpine doesn't know that your script is a executable (it is just a text file after all). bash is the executable that runs the script - so your bang solves it, or you could run it like this: setsid bash test.sh. CentOs might be a bit more clever and knows what you want to do
– Milos Matovic
Nov 12 at 12:51
1
Note that while it may work on Centos, you don't really know ifbashis really the shell being run (in this case, it was most likely run by/bin/shinstead). Adding a shebang is considered best practice as this explicitely states which program should run your script
– Aserre
Nov 12 at 13:08
add a comment |
1
I would assume that alpine doesn't know that your script is a executable (it is just a text file after all). bash is the executable that runs the script - so your bang solves it, or you could run it like this: setsid bash test.sh. CentOs might be a bit more clever and knows what you want to do
– Milos Matovic
Nov 12 at 12:51
1
Note that while it may work on Centos, you don't really know ifbashis really the shell being run (in this case, it was most likely run by/bin/shinstead). Adding a shebang is considered best practice as this explicitely states which program should run your script
– Aserre
Nov 12 at 13:08
1
1
I would assume that alpine doesn't know that your script is a executable (it is just a text file after all). bash is the executable that runs the script - so your bang solves it, or you could run it like this: setsid bash test.sh. CentOs might be a bit more clever and knows what you want to do
– Milos Matovic
Nov 12 at 12:51
I would assume that alpine doesn't know that your script is a executable (it is just a text file after all). bash is the executable that runs the script - so your bang solves it, or you could run it like this: setsid bash test.sh. CentOs might be a bit more clever and knows what you want to do
– Milos Matovic
Nov 12 at 12:51
1
1
Note that while it may work on Centos, you don't really know if
bash is really the shell being run (in this case, it was most likely run by /bin/sh instead). Adding a shebang is considered best practice as this explicitely states which program should run your script– Aserre
Nov 12 at 13:08
Note that while it may work on Centos, you don't really know if
bash is really the shell being run (in this case, it was most likely run by /bin/sh instead). Adding a shebang is considered best practice as this explicitely states which program should run your script– Aserre
Nov 12 at 13:08
add a comment |
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1
I would assume that alpine doesn't know that your script is a executable (it is just a text file after all). bash is the executable that runs the script - so your bang solves it, or you could run it like this: setsid bash test.sh. CentOs might be a bit more clever and knows what you want to do
– Milos Matovic
Nov 12 at 12:51
1
Note that while it may work on Centos, you don't really know if
bashis really the shell being run (in this case, it was most likely run by/bin/shinstead). Adding a shebang is considered best practice as this explicitely states which program should run your script– Aserre
Nov 12 at 13:08