Redirection using csh

Shell Programming and Scripting
1

I have a csh script which I am using to run a program

  set data   = $argv[1]
  set inmod  = $argv[2]
  set nxz    = $argv[3]

# Remove the file extension .pmod

  set data = ` echo $data | awk 'BEGIN { FS=".dat" } { print $1 }' `
  set inmod = ` echo $inmod | awk 'BEGIN { FS=".vmod" } { print $1 }' `
  set nx = ` echo $nxz | awk 'BEGIN { FS="x" } { print $1 }' `
  set nz = ` echo $nxz | awk 'BEGIN { FS="x" } { print $2 }' `
  set fout = ${data}-${nx}x${nz}-drw

# Run the program tdarwin
 
/nethome/chrisd/Zollo/Chrisd/Tommy-0911/bin/tdarwin base=sunsp.base  \
    data=$data.dat param="P" intp="LIN" inmod=$inmod.vmod            \
    nlay=1 std=on nxp=$nx nzp=$nz npop=60 dtau=0.15 mdacc=0.1        \
    varp=1.0 sigma0=100.0 maxiter=200 maxitertp=10 tol=0.0           \
    outmod=$fout.vmod backup=$fout.bck expl=$fout.exp                \
    vrb=high > $fout.log

I am trying to redirect the output to a file $fout.log but I'm not getting anything.

Trying to do something like below does not work

/nethome/chrisd/Zollo/Chrisd/Tommy-0911/bin/tdarwin base=sunsp.base  \
    data=$data.dat param="P" intp="LIN" inmod=$inmod.vmod            \
    nlay=1 std=on nxp=$nx nzp=$nz npop=60 dtau=0.15 mdacc=0.1        \
    varp=1.0 sigma0=100.0 maxiter=200 maxitertp=10 tol=0.0           \
    outmod=$fout.vmod backup=$fout.bck expl=$fout.exp                \
    vrb=high 2>&1 | tee $fout.log
2

If you just run:

/nethome/chrisd/Zollo/Chrisd/Tommy-0911/bin/tdarwin base=sunsp.base  \
    data=$data.dat param="P" intp="LIN" inmod=$inmod.vmod            \
    nlay=1 std=on nxp=$nx nzp=$nz npop=60 dtau=0.15 mdacc=0.1        \
    varp=1.0 sigma0=100.0 maxiter=200 maxitertp=10 tol=0.0           \
    outmod=$fout.vmod backup=$fout.bck expl=$fout.exp                \
    vrb=high

Do you get anything written to the screen?

3

Hi.

If you intend to use csh, you need to know the limitations. In this specific instance, see the very first section of Csh Programming Considered Harmful ... cheers, drl

4

Yes, I get everything on the screen working fine when I don't redirect.

5

Shoule be okay, the only thing I can think of is to check what noclobber is set to?

See noclobber in:
Man Page for csh (OpenSolaris Section 1) - The UNIX and Linux Forums

6

Hi.

In a csh script, what happens when you run:

echo one
echo two 2>&1

Best wishes ... cheers, drl

7

[quote]
In a csh script, what happens when you run:

echo one
echo two 2>&1

[quote]

No difference at all, because no error message was generated!

If you ran:

tony@tony-laptop:~$ ls -l fred > /tmp/logfile
ls: cannot access fred: No such file or directory
tony@tony-laptop:~$ cat /tmp/logfile

Then the listing of fred (if it had existed) would have gone into /tmp/logfile, that is stdout, file handle 1.
The error message is sent to stderr, file handle 2, allowing the user to see it even though stdout was sent to a log file.

If you then run:

tony@tony-laptop:~$ ls -l fred > /tmp/logfile 2>&1
tony@tony-laptop:~$ cat /tmp/logfile
ls: cannot access fred: No such file or directory
tony@tony-laptop:~$

Then the 2>&1 has redirected stderr to stdout, stdout was sent to /tmp/logfile so the error message also goes to /tmp/logfile.

8

Hi.

I have run the following script "s3" on Linux and Solaris. The string two is never displayed:

#!/bin/csh

ls -l /bin/csh

echo
echo one
echo two 2>&1
echo three

exit 0

producing:

% ./s3

one
three

The point is that "2>&1" does not work in the csh family as it does in the Bourne shell family. What happens is that a file named "1" is created with the content:

% cat 1
two 2

... cheers, drl

9

Sorry drl I was obviously thinking in Bourne shell mode, have not used C shell in anger since departing from SunOS! I must admit I can't see why anyone would script in C shell, it was a good interactive shell before Korn and Bash came along but it was never very good for scripting!