Using pipe in bash - is this the expected behaviour?
Hi all,
Am trying to convert a script from ksh to bash . One of the sub is something like below:
The output of running the above script is as below:
As you can see, am not getting the contents of the arrays if I use a pipe with the while loop.
Is this the expected behavior for bash ... Am kinda hoping I can avoid having to create a temporary file just like how am doing it on step_02_test.
What am wanting to accomplish is to be able to put into the array the output of the ps command having to redirect to a file and read from it. Maybe I don't need to use a while loop?
BTW also tried the following:
Unfortunately, the output from step_03_test gives as below:
Feedback/Advise much appreciated. Thanks.
Last edited by newbie_01; 05-23-2012 at 02:22 AM..
Reason: Added more information
Hi,
I have a bash script which I have referenced in the rc.local of my fedora linux OS. However it doesnt respond the same as when run in terminal from fedora.
The bash script has a series of interactive questions that require user input as shown:
#!/bin/bash
echo "Do you want to use... (1 Reply)
Hi!
Been working on a script and I've been having a problem. I've finally narrowed it down to this variable I'm setting:
servername=$(awk -v FS=\/ '{ print $7 } blah.txt | sed 's\/./-/g' | awk -v FS=\- '{print $1}')"
This will essentially pare down a line like this:
... (7 Replies)
Hello,
I am not sure, where I am missing in the scirpt, I am trying to grep few users from /etc/passwd file and if exists, I added line to echo as user exist, if not create it.
#!/bin/bash
for vid in v707 z307 z496 z163 z292 ; do
if
then
echo " $vid User exists "
else
... (2 Replies)
Hi there,
following code snippet should output nothing, IMHO. But the result is "THE END".
#!/bin/bash
if true ; thenexit
fi | grep "somesearchstring"
echo "THE END"using bash 4.1.9(1)
Bug or feature?
Hagen (5 Replies)
Hello.
In the following :
RESTORE_FF contain a file name : a_file.tar.gz
I am testing in a directory if "a_file.tar.gz" exists and or if any file like "a_file.tar.gz" exists.
So "a_file.tar.gz" will give me file exists
So "a_file.tar.gz." will give me file exists
So... (5 Replies)
Good morning
Recently we needed to change the password from a redhat 6.5 system that no one knew the root password.
Starting the system with the init=/bin/bash method took us to the following scenario:
system_vg active with only root_lv and tmpfs mounted.
our entries at fstab are like... (1 Reply)
Hello Gurus :)
I'm "currently" (for the last ~2weeks) writing a script to build ffmpeg with some features from scratch.
This said, there are quite a few features, libs, to be downloaded, compiled and installed, so figured, writing functions for some default tasks might help.
Specialy since... (3 Replies)
I'm trying to understand why a script behaves different when run through a pipe.
My OS:
Linux myip 3.13.0-92-generic #139-Ubuntu SMP Tue Jun 28 20:42:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
This script (myscript.sh):
#!/bin/bash
echo whoami:
whoami
echo who:
who
echo who... (2 Replies)
Repeat this text in a file named notes.txt and run the script
Before bash is a good language a blank line appears
Also, the following notes are displayed incorrectly
What is bad?
==================================
Title : Note 1
==================================
Category: Computer
Date... (3 Replies)
Hi Guys,
I wrote a collection of bash functions years ago and now need to use them again but
I'm getting some error messages when eval tries to expand the variables names.
I recollect that I used the shopt command to set one of the options but I can't quite
remember the command that I... (8 Replies)