I tried enclosing in single quotes. But it doesn't work properly. Any Idea how I can fix this ?
Code:
# cat test_singleQuote.sh
#!/bin/bash
#Usage : /root/SCRIPTS/test_singleQuote.sh <Argument1>
# single quote variant of test.sh
echo -e "\n"
## Currently you are root user
## su to oracle user and run the following commands which are separated by semi colon
su -l oracle -c 'export ORACLE_SID=$11; echo $ORACLE_SID >/tmp/ORACLE_SID_VAR; export MYVAR1=Stomper; \
export MYVAR2=Duffy; echo `whoami` >/tmp/who.txt;echo $1 >/tmp/Arg_name.txt; echo $ORACLE_SID >/tmp/Instancename.txt; echo $MYVAR2 >/tmp/MYVAR2.txt'
whoami ## Now you should be back as root
#
#
--- Executing the script
#
Code:
# test_singleQuote.sh SOFIA
root
-- Verifying the contents of files
# cat /tmp/ORACLE_SID_VAR
1 ---------------------> I am expecting SOFIA1
#
# cat /tmp/who.txt
oracle ---------------------> Worked as expected
#
# cat /tmp/Arg_name.txt
----------------------> null. I was expecting SOFIA
#
# cat /tmp/MYVAR2.txt
Duffy ---------------------> Worked as expected
#
I am trying to run the following code from a script file but it complains that syntax of (both instances of) grep is wrong.
When I copy and paste it to the terminal, it is OK. Any idea what the problem might be?
set i = `grep -c #define flags.h`
while ($i>20)
@ i--
my func (`cat... (4 Replies)
Howdie everyone...
I have a shell script RemoveFiles.sh
Inside this file, it only has two commands as below:
rm -f ../../reportToday/temp/*
rm -f ../../report/*
My problem is that when i execute this script, nothing happened. Files remained unremoved. I don't see any error message as it... (2 Replies)
Hi,
I have a shell script in which I need to switch to another user and execute some commands and then come back to the original user.
To make it more clear -
I have to log in as user root then 'su' to jag - execute a script called backup.sh and then logout and come back to root again..
... (1 Reply)
Dear All,
I want to switch a user inside a shell script.My current user say x and user y to whom i want to switch both have login on the same server,the one on which i want to execute my script on.
"I want to do something like this
su - y
Password should be provided in the script itself.And... (6 Replies)
Hi folks
I'm coding on Ubuntu 9.04 standard shell.
I'm writing a script that needs to generate a random number at some point of its execution.
When I do
echo $RANDOMas a command inside shell, I clearly get some randomly generated number
However when I do
i=`$RANDOM`
echo $ior even... (14 Replies)
I am writing perl script to configure Cisco device but Variables inside Net::Telnet::Cisco Module doesn't work and passed to device without resolving.
Please advise.
here is a sample of script:
use Net::Telnet::Cisco;
$device = "10.14.199.1";
($o1, $o2, $o3, $o4) = split(/\./,$device);... (5 Replies)
Hello all,
Something strange going on with a shell script I'm writing. It's trying to write a list of files that it finds in a given directory to another file. But I also have a skip list so matching files that are in that skip list should be, well uhm, skipped :)
Here's the code of my... (2 Replies)
hi,
i want to login as a different user inside a shell script and then call another shell script from that script.
how to do that?
original script : script_A.sh
so when the script_A.sh is called , i want to login as a different user and then call another shell script(script_B.sh) from... (3 Replies)
Hello
I have a shell script that is run as root. Script rins ok until the point where it have to switch to user "mqm" to run other commands. It just hangs at the point of this line in the script
su - mqm -c "dspmq"
I ran the same commands at the terminal and they run fine.
Any thoughts. (6 Replies)
Discussion started by: mo12
6 Replies
LEARN ABOUT DEBIAN
unbuffer
UNBUFFER(1) General Commands Manual UNBUFFER(1)NAME
unbuffer - unbuffer output
SYNOPSIS
unbuffer program [ args ]
INTRODUCTION
unbuffer disables the output buffering that occurs when program output is redirected from non-interactive programs. For example, suppose
you are watching the output from a fifo by running it through od and then more.
od -c /tmp/fifo | more
You will not see anything until a full page of output has been produced.
You can disable this automatic buffering as follows:
unbuffer od -c /tmp/fifo | more
Normally, unbuffer does not read from stdin. This simplifies use of unbuffer in some situations. To use unbuffer in a pipeline, use the
-p flag. Example:
process1 | unbuffer -p process2 | process3
CAVEATS
unbuffer -p may appear to work incorrectly if a process feeding input to unbuffer exits. Consider:
process1 | unbuffer -p process2 | process3
If process1 exits, process2 may not yet have finished. It is impossible for unbuffer to know long to wait for process2 and process2 may
not ever finish, for example, if it is a filter. For expediency, unbuffer simply exits when it encounters an EOF from either its input or
process2.
In order to have a version of unbuffer that worked in all situations, an oracle would be necessary. If you want an application-specific
solution, workarounds or hand-coded Expect may be more suitable. For example, the following example shows how to allow grep to finish pro-
cessing when the cat before it finishes first. Using cat to feed grep would never require unbuffer in real life. It is merely a place-
holder for some imaginary process that may or may not finish. Similarly, the final cat at the end of the pipeline is also a placeholder
for another process.
$ cat /tmp/abcdef.log | grep abc | cat
abcdef
xxxabc defxxx
$ cat /tmp/abcdef.log | unbuffer grep abc | cat
$ (cat /tmp/abcdef.log ; sleep 1) | unbuffer grep abc | cat
abcdef
xxxabc defxxx
$
BUGS
The man page is longer than the program.
SEE ALSO
"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
1 June 1994 UNBUFFER(1)
03-24-2014
