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Thorsten Kampe writes: |
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> * Todd Berman (2004-05-31 08:39 +0100) |
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> > So when you have been up for 30 hours you are going to remember to type |
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> > -c? cause aliasing will break those same shell scripts... |
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> |
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> Aliases /never/ break scripts. |
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> |
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> > this is a pointless debate in my opinion, especially one to have here |
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> > over a course of days. If you want a safe rm, alias -i and accept |
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> > breakage [...] |
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> |
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> There is nothing to accept even if someone would deny the fact that |
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> shells are primarily built and used for interactive use. |
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> |
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> Scripts are just scripts. They work for me or they don't and if they |
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> don't I fix them. If I would care about this fact then I wouldn't use |
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> a shell script but a real programming language (Python, whatever). |
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> |
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> But let me repeat: aliases don't break scripts. |
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|
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That's true IF aliases are defined in the right place. |
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|
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Unfortunately, the "rc" files that are automatically executed by bash |
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processes are quite hard to make out, depending on whether the shell |
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is a login shell, an interactive shell or a script. |
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|
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>From my reading of bash(1), I reduced it to the following rules (note |
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the OR ELSE clauses that are selected only if no previous clause was |
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selected): |
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|
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# WHEN starting |
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# AND ( interactive AND login ) OR ( non-interactive AND --login ) ) |
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# DO /etc/profile |
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# THEN ~/.bash_profile |
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# OR ELSE ~/.bash_login |
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# OR ELSE ~/.profile |
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# |
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# WHEN starting |
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# AND interactive AND NOT login |
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# DO ~/.bashrc |
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# |
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# WHEN starting |
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# AND NOT interactive |
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# DO $BASH_ENV |
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# |
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# WHEN exiting |
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# AND login |
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# DO ~/.bash_logout |
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|
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|
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So, for scripts, it depends on the value of BASH_ENV. You have to put |
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your aliases in a file that is not designed by BASH_ENV nor sourced* |
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by the file designed by BASH_ENV. |
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|
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-- |
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__Pascal_Bourguignon__ http://www.informatimago.com/ |
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There is no worse tyranny than to force a man to pay for what he doesn't |
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want merely because you think it would be good for him.--Robert Heinlein |
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http://www.theadvocates.org/ |
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|
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-- |
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