Shell Scripting Questions

blaoulis · 07-11-2006, 06:28 PM

Hey!!
I m using cshell and i want to examine if a string that i read is integer? Is there a function is_int() ? How can i do that with grep?

Secondly, How can i send mail via a script using the mail command?
( write subject + content)

Thx in advace!!

taylor_venable · 07-11-2006, 08:34 PM

I don't know about the first one, but the second one is easy. For subject just use the -s option with the subject following (quoted if it's more than one word). For content, just pipe the message to it on standard input.

Hobbletoe · 07-12-2006, 06:56 AM

With grep, you can check out the character classes (if you can't find it under grep, check regular expressions). [:digit:] or [:alnum:] is what I think you are want.

blaoulis · 07-12-2006, 10:42 AM

I tried something like this

Code:

#!/bin/csh

echo "$argv[1]" > $argv[1]
grep "[:alnum:]" $argv[1]

./isdigit 12
./isdigit dd123
dd123
./isdigit dddd
dddd
./isdigit 123s

It worked in all cases but the last one ( which is not digit ) does't work. any help?

taylor_venable · 07-12-2006, 12:02 PM

How about this pipeline:

Code:

echo "$argv[1]" | grep -E '^[[:digit:]]+$' | wc -l

This returns one when $argv[1] is a sequence of digits, or zero when it's not. Also, by piping the argument to grep on stdin you don't have to create a temporary file.

blaoulis · 07-12-2006, 07:21 PM

thx ,
I found another way doing this with sed!
Something else i want to ask,
there is a problem in csh with functions??

Code:

#!/bin/csh

usage()
{
echo "usage"
}
usage

./usage

Badly placed ()'s

I tried to replace usage() with function usage, but same problem.
Any help?

Edit:: Just Founded it ::
Csh does't support function only aliases!!!