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Old 05-02-2013, 12:38 PM   #1
LQ Newbie
Registered: Dec 2007
Posts: 6

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Bash - How do you reference earlier string on line?

I'm looking for something similar to an event designator, but not for history. I'm wondering if it's possible for the current command that isn't in history yet.

Examples using event designators in history:
# cp ~/file /longer/path/name/newfile
# ls -l !cp:2
ls -l /longer/path/name/newfile

# cat /path/to/some/file
# ^cat^rm^
rm /path/to /some/file
What I would like know is if you can do something like:

# cp /path/to/some/file [$foo].new
Where [$foo] references the second "string" in the line which would be "/path/to/some/file". The actual command used here is irrelevant, I know rename of several other equivalents could be used in this example. I've read through the man page for BASH, but I don't even know what to call what I'm looking for.

Anyone have any ideas?
Old 05-02-2013, 02:25 PM   #2
Senior Member
Registered: Dec 2004
Location: Olympia, WA, USA
Distribution: Fedora, (K)Ubuntu
Posts: 4,186

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Try # f=/path/to/some/file;cp $f $

I.e., put the part(s) you want to repeat into bash variables and use the variables. There are usually a whole lot of globally defined variables (and scripts) pre-defined by your distribution. Just run set (with no arguments) to see what's in the full list. (On Fedora, I need a set | less since that list includes many global functions.)


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