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Redirect output from csh script 1
- Thread starter chorgan
- Start date
raider2001
Technical User
To redirect to standard output:
command > file
To redirect to standard output and standard error:
command >& file
command > file
To redirect to standard output and standard error:
command >& file
command >& outputfile
(note the & after the >, with no space between them. This redirects both the standard output & standard errors to outputfile) TandA
Day by day, the penguins steal my sanity.
(note the & after the >, with no space between them. This redirects both the standard output & standard errors to outputfile) TandA
Day by day, the penguins steal my sanity.
- Thread starter
- #4
I have this:
command >& myfile.txt
but it is giving me an error - "Bad Number"
and referencing the file name I used do i need to declare the file name as a variable ?
I tried putting it in "" but got the same error
There is somethiung basic and blatantly obvious that I am missing, very possible as Ive never coded a Cshell b4 and only a little dabble of awk/perl/bourne shell
command >& myfile.txt
but it is giving me an error - "Bad Number"
and referencing the file name I used do i need to declare the file name as a variable ?
I tried putting it in "" but got the same error
There is somethiung basic and blatantly obvious that I am missing, very possible as Ive never coded a Cshell b4 and only a little dabble of awk/perl/bourne shell
-
1
- #5
Hi,
Maybe redirecting the output from the command to eliminate the warning isn't what is needed. Maybe you need to figure out why the warning is coming out and see if you can eliminate it from your script.
For example, if command is something like.....
ls -l *.q | grep joke
( poor example but illustrates point)
and the LS would report 'No Match' which comes out through STDERR. You can correct this by also redirecting STDERR to the GREP which will throw it away because it doesn't match the grep pattern.
ls -l *.c |& grep joke
Adding to the posts about
Most UNIX's allow you to specify all output goes to the bit bucket. ( /dev/null )
command ... >&! /dev/null
> means redirect stdout
& means redirect Stderr
! means delete the file if it already exists.
There is no way just to redirect STDERR, so if you want the stdout to come out to the user but not the stderr you need to do something like....
( command > /tmp/out.$$ ) >&! /dev/null
cat /tmp/out.$$
rm -f /tmp/out.$$
This will redirect stdout to the /tmp/out.$$ file and then display it to the user and the stderr goes to the bit bucket.
hope this helps.
Maybe redirecting the output from the command to eliminate the warning isn't what is needed. Maybe you need to figure out why the warning is coming out and see if you can eliminate it from your script.
For example, if command is something like.....
ls -l *.q | grep joke
( poor example but illustrates point)
and the LS would report 'No Match' which comes out through STDERR. You can correct this by also redirecting STDERR to the GREP which will throw it away because it doesn't match the grep pattern.
ls -l *.c |& grep joke
Adding to the posts about
Most UNIX's allow you to specify all output goes to the bit bucket. ( /dev/null )
command ... >&! /dev/null
> means redirect stdout
& means redirect Stderr
! means delete the file if it already exists.
There is no way just to redirect STDERR, so if you want the stdout to come out to the user but not the stderr you need to do something like....
( command > /tmp/out.$$ ) >&! /dev/null
cat /tmp/out.$$
rm -f /tmp/out.$$
This will redirect stdout to the /tmp/out.$$ file and then display it to the user and the stderr goes to the bit bucket.
hope this helps.
- Thread starter
- #6
Hi,
Then for your output file figure out which tty device you are using for STDOUT and make that your output file.
set t = `tty`
( command >! $t ) >&! /dev/null
Again this will make the STDOUT go to the TTY device ( which should be the screen ) and STDERR will go to the bit bucket.
Then for your output file figure out which tty device you are using for STDOUT and make that your output file.
set t = `tty`
( command >! $t ) >&! /dev/null
Again this will make the STDOUT go to the TTY device ( which should be the screen ) and STDERR will go to the bit bucket.
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