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POHow can I standardize shell script header #! on different hosts?
 

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  1. POHow can I standardize shell script header #! on different hosts?
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    <p>I manage a large number of shell (ksh) scripts on server A. Each script begins with the line...</p> <pre><code>#!/usr/bin/ksh </code></pre> <p>When I deploy to machine B, C, and D I frequently need to use a different shell such as /bin/ksh, /usr/local/bin/ksh or even /usr/dt/bin/ksh. Assume I am unable to install a new version of ksh and I am unable to create links in any protected directories such as /usr/local/bin. At the moment I have a sed script which modifies all the scripts but I would prefer not to do this. I would like to standardize the header so that it no longer needs to be changed from server to server. I don't mind using something like</p> <pre><code>#!~/ksh </code></pre> <p>And creating a link which is on every server but I have had problems with finding home using "~" in the past when using rsh (maybe is was ssh) to call a script (AIX specifically I think). Another option might be to create a link in my home directory and ensuring that it is first in my PATH, and simply using</p> <pre><code>#!ksh </code></pre> <p>Looking for a good solution. Thanks.</p> <p>Update 8/26/11 - Here is the solution I came up with. The installation script looks for the various versions of ksh installed on the server and then copies one of the ksh 93 programs to /tmp/ksh93. The scripts in the framework all refer to #!/tmp/ksh93 and they don't need to be changed from one server to the other. The script also set some variables so that if the file is every removed from /tmp, it will immediately be put back the next time a scheduled task runs, which is at a minimum every minute.</p>
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    1. COPutting anything permanent in `/tmp` is ... very unorthodox, not to mention liable to failure unless you arrange for the file to be recreated on reboot.
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      1. POHow can I standardize shell script header #! on different hosts?
      1. USJonathan Leffler
 

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