quang@CSUFRES.CSUFRESNO.EDU (Quang Ngo) (05/02/91)
1)
In csh, we can have something like
set a = (This is a string)
echo $a[2]
which prints 'is'
Now, let's say I have
set a = "This is a string"
How do I print 'str' ?
2)
Let's say I have a file 'data' which contains the following 3 lines.
John 234
Bill 123
Tom 231
and a csh script 'test'
#!/bin/csh -f
foreach a (`cat data`)
echo $a
end
This prints
John
234
Bill
123
Tom
231
Looks like the FS (file separator) is space and/or newline, and ???
I want the FS just to be newline so that 'test' would print
John 234
Bill 123
Tom 231
The question is how? I know how to take care these problems in (n/g)awk.
Thanks,
-Quang (quang@csufres.CSUFresno.EDU)rickert@mp.cs.niu.edu (Neil Rickert) (05/02/91)
In article <9105020702.AA06707@csufres.CSUFresno.EDU> quang@CSUFRES.CSUFRESNO.EDU (Quang Ngo) writes: > >and a csh script 'test' > Don't EVER have a script called test. One of these days you will want to write a Bourne shell script, perhaps to do the kind of things that are giving you trouble in csh. And as soon as you use 'test' within your sh script you will have trouble. -- =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*= Neil W. Rickert, Computer Science <rickert@cs.niu.edu> Northern Illinois Univ. DeKalb, IL 60115 +1-815-753-6940
jik@athena.mit.edu (Jonathan I. Kamens) (05/02/91)
In article <9105020702.AA06707@csufres.CSUFresno.EDU>, quang@CSUFRES.CSUFRESNO.EDU (Quang Ngo) writes: |> 1) [how to take substrings in csh] Csh has no facility for doing substrings. You need to use something like awk or expr. Given your example: |> Now, let's say I have |> |> set a = "This is a string" |> |> How do I print 'str' ? You could do something like this: echo "$a" | awk '{print substr($0, 11, 3)}' |> 2) [How to keep spaces from being record separators in a data file read |> into a foreach loop using backquote substitution and "cat"] Enclose the backquote substitution in double quotes. For example, given your data file: |> John 234 |> Bill 123 |> Tom 231 And this script: #!/bin/csh -f foreach a ("`cat data`") echo $a end (which differs from yours only in the addition of backquotes), the following output results: John 234 Bill 123 Tom 231 -- Jonathan Kamens USnail: MIT Project Athena 11 Ashford Terrace jik@Athena.MIT.EDU Allston, MA 02134 Office: 617-253-8085 Home: 617-782-0710
jik@athena.mit.edu (Jonathan I. Kamens) (05/03/91)
In article <1991May2.165922.10558@athena.mit.edu>, I wrote: |> (which differs from yours only in the addition of backquotes), ^^^^^^^^^^ I should have said "double quotes." Thanks to Robert Earl for pointing this out to me in E-mail.... -- Jonathan Kamens USnail: MIT Project Athena 11 Ashford Terrace jik@Athena.MIT.EDU Allston, MA 02134 Office: 617-253-8085 Home: 617-782-0710
itkin@mrspoc.Transact.COM (Steven M. List) (05/03/91)
quang@CSUFRES.CSUFRESNO.EDU (Quang Ngo) writes: >1) In csh, we can have something like > >set a = (This is a string) >echo $a[2] > >which prints 'is' > >Now, let's say I have > >set a = "This is a string" > >How do I print 'str' ? expr "$a" : '.\{10\}\(...\).*' or echo "$a" | cut -c11-13 or... >2) Let's say I have a file 'data' which contains the following 3 lines. >... >The question is how? I know how to take care these problems in (n/g)awk. I don't have an answer to the second one in C shell syntax. In Bourne (/bin/sh) it's easy: while read $LINE do echo $LINE done < datafile and variations on that theme. But csh doesn't have anything quite like "read". -- +----------------------------------------------------------------------------+ : Steven List @ Transact Software, Inc. :^>~ : : Chairman, Unify User Group of Northern California : : itkin@Transact.COM :