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Top Forums Shell Programming and Scripting Executing MQ commands in Perl Post 302986575 by Aia on Sunday 27th of November 2016 03:42:25 PM
Old 11-27-2016
Quote:
Originally Posted by giridhar276
If you want to capture the output of any command, we then will be writing the system command in `` or qx.

`` an qx works fine with all linux and windows system commands.

But when I execute the below code.. it is displaying the output on the screen directly instead of storing to variable

crtmqm is the command used to create queue manager in MQ Series.

Code:
$name = "clientinfo";
@output = `crtmqm $name`;
print "@output\n";

Could anyone please help me in storing the output of MQ command in perl variable.
FYI,
You are storing the output of it in a variable, specifically in an array variable named output. But then, you are asking the program to display the content of output (which is what you just saved) to the stdout via the print, that's why you see it displayed. Remove the print "@output\n"; and you will not see stdout in your screen. You will still see any stderr, if any.

`` and qx() does not capture stderr (reporting messages), by default, it does only stdout. If you want to capture stderr as well you need to tell it:
`crtmqm $name 2>$1`
 

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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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