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get command alias name in perl script?

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# 1  
Old 01-15-2008
get command alias name in perl script?
hi all,

In my perl script, I need to know the command alias name to make my program flexible. I tried many methods like system("alias cmd"), `alias cmd`, use shell qw,etc. But no one could recognize the built in command alias. If I use `which cmd`, it would look for the command based on environmental PATH and skip the alias information. Finally, I found a useful document from Shell - perldoc.perl.org. It says "It isn't possible to call shell built in commands, but it can be done by using a workaround, e.g. shell( '-c', 'set' )." Does anyone know how to implement the work around method "shell( '-c', 'set' )" or any possible method to get command alias information? I'm really exhausted for this problem. Smilie Please give me a hand.

Thanks for your help!
Last edited by ktmchen; 01-15-2008 at 09:15 AM..
# 2  
Old 01-15-2008
If you are talking about executing a system command froma perl program, then you can very well use the system() function in perl. read on that. it is very simple execution!

and also you can always `` - backtiks for the command executions.


-ilan
# 3  
Old 01-15-2008
I didn't quite got what you need to do. My assumption : you need to get some info from alias ?
If I want to set an alias, I'd put it $HOME/.bashrc or /etc/profile, depends.
If you invoke "alias" from shell you will get something like :
Quote:
alias l.='ls -d .* --color=tty'
alias ll='ls -l --color=tty'
alias ls='ls --color=tty'
alias mc='. /usr/share/mc/bin/mc-wrapper.sh'
alias vi='vim'
alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
so, do you want to manipulate / parse this output ?
# 4  
Old 01-15-2008
hi ilan,

Thanks for your help. But commands like "alias", "bg", "set", etc are shell built-in functions. They couldn't execute by system() or ``. At least my platform(Red Hat Enterprise Linux AS release 3) can't. I don't know how to get the command alias information. Maybe there has other way to get alias name istead of using shell built-in function.
# 5  
Old 01-15-2008
hi sysgate,

Yes, I want to get user's alias information. My script is wrote for every user and they may have their own command alias names. For some reasons, a latest beta executable command was alias to another name and my program needs to call it. For writing a flexible program, I want to detect alias name in my script but use the absolute path. The point is how to get the alias name in my script. Is it possible? Any other workarounds? Thank you!
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