Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

Re: Re: bash alias suggest-ation

by khkramer (Scribe)
on Jan 05, 2002 at 03:42 UTC ( [id://136417]=note: print w/replies, xml ) Need Help??


in reply to Re: bash alias suggest-ation
in thread bash alias suggest-ation

Not a newbie-level question at all...

The tricky thing about this script is getting it to interact properly with the system environment. There are a couple of problems: 1) you can't get at the history list from inside the script because "history" is a shell built-in and the ".bash_history" file isn't kept up to date, and 2) you can't create aliases from inside the script because there's no way to export aliases out to the calling context.

The first problem is addressed by taking the history list as input. (But not simply as STDIN, because then you couldn't prompt the user for input.)

The second problem is solved by using the script in a "command substitution" context -- surrounded by backticks or $(). The only thing that gets printed on STDOUT is the name of the file to which the script writes the "alias foo='bar'" commands. That filename is what the bash "source" builtin sees. So, you don't have access to STDOUT for the interface (it doesn't even show up on the terminal): you have to use STDERR instead. Definitely a kludgy hack, but it works fine for this purpose.

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://136417]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others exploiting the Monastery: (5)
As of 2024-03-29 10:57 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found