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literal ^ in strings

 
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Jason Quinn
IRAF Guru


Joined: 07 Apr 2006
Posts: 151
PostPosted: Thu Oct 25, 2012 4:43 am    Post subject: literal ^ in strings Reply with quote
I've noticed a issue with literal carets in strings. This arose because I was trying to use the match task in a script. I wanted to do a command like

Code:
match "^1" myfile


to list all lines that begin with the number 1. This however doesn't work. I can escape the caret:

Code:
match "\^1" myfile


and it will work.

There are several related points. The help for match doesn't suggest the escape needs to be used for the caret. And recalling the command using the up arrow keys starts stripping away escapes until the caret-number combination is interpreted as a history recall. Not sure what the intended behaviour is here.

The history mechanism does act weird here though.

Cheers,
Jason
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fitz
Site Admin


Joined: 30 Sep 2005
Posts: 3255
Location: Tucson
PostPosted: Sun Oct 28, 2012 1:00 pm    Post subject: Reply with quote
Hi Jason,

This is a CL bug that apparent'y has been around forever, the history processing should not be done on literal strings of the command. When setting the params in epar things work as expected, otherwise the escapes are needed (but not handled properly). This will be fixed for the next update.

-Mike
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