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Full Discussion: Use script to monitor command output question? (like Linux watch)
Top Forums Shell Programming and Scripting Use script to monitor command output question? (like Linux watch) Post 302559524 by nnnnnnine on Tuesday 27th of September 2011 09:53:32 AM
Old 09-27-2011
Use script to monitor command output question? (like Linux watch)
Hi

I want to write a script, help me to monitor command output.

This script like Linux "watch" command.

Below is my script:
Code:
[root@host scripts]# cat watch.sh 
#!/bin/bash

while true
do
        clear
        echo "command: $*"
        ( $* )
        sleep 2
done

Then I run this script below
Code:
[root@station54 scripts]# ./watch.sh ls -l

Output like below
Code:
Interval 2 sec, Command: ls -l
total 40
drwxr-xr-x 2 root root 4096 Sep 27 21:34 aaa
-rw-r--r-- 1 root root    0 Sep 27 21:34 bbb
-rw-r--r-- 1 root root    0 Sep 27 21:34 ccc
-rw-r--r-- 1 root root    0 Sep 27 21:34 ddd
-rw-r--r-- 1 root root    0 Sep 27 21:34 eee
-rw-r--r-- 1 root root    0 Sep 27 21:34 fff
-rw-r--r-- 1 root root    0 Sep 27 21:34 ggg
-rwxr--r-- 1 root root   93 Sep 27 21:36 watch.sh

Then I run this script again "with pipe line and grep." , and every thing wrong...(screen not clear ...etc)
Code:
[root@station54 scripts]# ./watch.sh ls -l | grep eee

BUT Output like below
Code:
[root@station54 scripts]# ./watch.sh ls -l | grep eee
-rw-r--r-- 1 root root    0 Sep 27 21:34 eee
-rw-r--r-- 1 root root    0 Sep 27 21:34 eee  
-rw-r--r-- 1 root root    0 Sep 27 21:34 eee 
.
.

I except output like below
Code:
Interval 2 sec, Command: ls -l | grep eee
-rw-r--r-- 1 root root    0 Sep 27 21:34 ddd

How to complete this ....? please give me a hand.

Thanks,
 

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LEARN ABOUT MOJAVE

rpm2cpio

rpm2cpio(1)                                                        User Commands                                                       rpm2cpio(1)

NAME

       rpm2cpio - convert Red Hat Package (RPM) to cpio archive

SYNOPSIS

       rpm2cpio [file.rpm]

DESCRIPTION

       The  rpm2cpio  utility converts the .rpm file specified as its sole argument to a cpio archive on standard output. (See NOTES.) If no argu-
       ment is given, an rpm stream is read from standard input. In both cases, rpm2cpio will fail and print a usage message if the standard  out-
       put is a terminal. Therefore, the output is usually redirected to a file or piped through the cpio(1) utility.

EXAMPLES

       Example 1: Converting an rpm file

       example% rpm2cpio Device3Dfx-1.1-2.src.rpm | cpio -itv
       CPIO archive found!
       -rw-r--r--   1 root  root    2635 Sep 13 16:39 1998, 3dfx.gif
       -rw-r--r--   1 root  root   11339 Sep 27 16:03 1998, Dev3Dfx.tar.gz
       -rw-r--r--   1 root  root    1387 Sep 27 16:04 1998, Device3Dfx-1.1-2.spec
       31 blocks

       Example 2: Converting from standard input

       example% rpm2cpio < Device3Dfx-1.1-2.src.rpm | cpio -itv
       CPIO archive found!
       -rw-r--r--   1 root  root    2635 Sep 13 16:39 1998, 3dfx.gif
       -rw-r--r--   1 root  root   11339 Sep 27 16:03 1998, Dev3Dfx.tar.gz
       -rw-r--r--   1 root  root    1387 Sep 27 16:04 1998, Device3Dfx-1.1-2.spec
       31 blocks

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWrpm                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       cpio(1), attributes(5)

NOTES

       rpm2cpio handles versions 3 and 4 RPMs.

SunOS 5.10                                                          20 Aug 2001                                                        rpm2cpio(1)
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