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Top Forums UNIX for Beginners Questions & Answers Extracting some part of Perl's Expect Buffer Post 303035890 by suneet17 on Friday 7th of June 2019 01:31:08 AM
Old 06-07-2019
Extracting some part of Perl's Expect Buffer

Hi,

I am capturing command's output on remote host using Expect. The problem is that the command line arguments also getting print with the output in file and also need to print last two relevant columns (percentage used and its mounted point).

The output of $exp->before() buffer is :
Code:
df
Filesystem      1K-blocks     Used Available Use%     Mounted on
devtmpfs         4063064        8   4063056    1%            /dev
tmpfs            4074272        0   4074272       0%             /dev/shm
tmpfs            4074272   141132   3933140     4%             /run
tmpfs            4074272        0   4074272        0%           /sys/fs/cgroup
/dev/sda1       20510332 15487436   3974372  80%       /
/dev/sdb1       10189112   964776   8700100    10%        /var/log
tmpfs             814856        0    814856            0%           /run/user/107
tmpfs             814856        0    814856          0%             /run/user/0

I need following output. Deleted first line (df) and only last two columns interchanged:


Code:
Mounted on     Use%  
/dev                       1%
/dev/shm             0%
/run                      4%
/sys/fs/cgroup   0%
/ 	                     80%
/var/log              10%
/run/user/107    0%
/run/user/0       0%

Thanks

Moderator's Comments:
Mod Comment
Please wrap all code, files, input & output/errors in CODE tags.
It makes it far easier to read and preserves spaces for indenting or fixed-width/tabulated data.

Last edited by rbatte1; 06-07-2019 at 07:05 AM..
 

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DISLOCATE(1)						      General Commands Manual						      DISLOCATE(1)

NAME
Dislocate - disconnect and reconnect processes SYNOPSIS
dislocate [ program args... ] INTRODUCTION
Dislocate allows processes to be disconnected and reconnected to the terminal. Possible uses: o You can disconnect a process from a terminal at work and reconnect from home, to continue working. o After having your line be dropped due to noise, you can get back to your process without having to restart it from scratch. o If you have a problem that you would like to show someone, you can set up the scenario at your own terminal, disconnect, walk down the hall, and reconnect on another terminal. o If you are in the middle of a great game (or whatever) that does not allow you to save, and someone else kicks you off the ter- minal, you can disconnect, and reconnect later. USAGE
When run with no arguments, Dislocate tells you about your disconnected processes and lets you reconnect to one. Otherwise, Dislocate runs the named program along with any arguments. By default, ^] is an escape that lets you talk to Dislocate itself. At that point, you can disconnect (by pressing ^D) or suspend Dislo- cate (by pressing ^Z). Any Tcl or Expect command is also acceptable at this point. For example, to insert the contents of a the file /etc/motd as if you had typed it, say: send -i $out [exec cat /etc/motd] To send the numbers 1 to 100 in response to the prompt "next #", say: for {set i 0} {$i<100} {incr i} { expect -i $in "next #" send -i $out "$i " } Scripts can also be prepared and sourced in so that you don't have to type them on the spot. Dislocate is actually just a simple Expect script. Feel free to make it do what you want it to do or just use Expect directly, without going through Dislocate. Dislocate understands a few special arguments. These should appear before any program name. Each should be sep- arated by whitespace. If the arguments themselves takes arguments, these should also be separated by whitespace. The -escape flag sets the escape to whatever follows. The default escape is ^]. CAVEATS
This program was written by the author as an exercise to show that communicating with disconnected processes is easy. There are many fea- tures that could be added, but that is not the intent of this program. SEE ALSO
Tcl(3), libexpect(3) "Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995. AUTHOR
Don Libes, National Institute of Standards and Technology 7 October 1993 DISLOCATE(1)
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