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Top Forums Shell Programming and Scripting >& redirection not working within csh script Post 302864553 by silencio on Wednesday 16th of October 2013 05:12:20 PM
Old 10-16-2013
>& redirection not working within csh script

I'm having a strange problem with basic
Code:
>&

output redirection to a simple log file in csh. When I run this particular output redirection on the command line, it works, but then when I run the same output redirection command
Code:
>&

in my c shell script, I get a blank log file. Nothing is output to the screen, either.

It gets even stranger because the
Code:
>&

output redirection works within my c shell script on Redhat Linux but not when I run my c shell script on my current operating system, CentOS V. 2.16.0 release 5.8.

Is there some system variable that needs to be set in CentOS V. 2.16.0 release 5.8, or why does

Code:
program $inputvar1 $inputvar2 $inputvar3 >& output.log

work in *every other situation* (both command line and running in my c shell script on some computers) except when running my csh script on CentOS V. 2.16.0 release 5.8? It should work the same within the cshell script on all computers, shouldn't it? And does anyone have a work-around that will successfully output to a log file in a csh script on CentOS V. 2.16.0 release 5.8?

EDIT: I was thinking maybe some system variable in CentOS V. 2.16.0 release 5.8 is buffering output from csh? I have no idea, though.
 

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SCRIPT(1)							   User Commands							 SCRIPT(1)

NAME
script - make typescript of terminal session SYNOPSIS
script [options] [file] DESCRIPTION
script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file type- script. OPTIONS
-a, --append Append the output to file or typescript, retaining the prior contents. -c, --command command Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e, --return Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f, --flush Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can supervise real-time what is being done using `cat foo'. --force Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic link. -q, --quiet Be quiet. -t, --timing[=file] Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. -V, --version Output version information and exit. -h, --help Output help and exit. NOTES
The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1). HISTORY
The script command appeared in 3.0BSD. BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util- linux/>. util-linux September 2011 SCRIPT(1)
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