Sponsored Content
Top Forums Shell Programming and Scripting Having a terrible problem with quotes/single quotes! Post 302542130 by jondecker76 on Tuesday 26th of July 2011 08:22:41 PM
Old 07-26-2011
Having a terrible problem with quotes/single quotes!

Hello. I'm trying to write a bash script that uses GNU screen and have hit a brick wall that has cost me many hours... (I'm sure it has something to do with quoting/globbing, which is why I post it here)

I can make a script that does the following just fine:

test.sh:
Code:
#!/bin/bash

# make a screen session named blah with a window named "dummy"
screen -dmS blah -t dummy
# and give it a specific hardstatus line
screen -r blah -X hardstatus on
screen -r blah -X hardstatus alwayslastline
screen -r blah -X hardstatus string '%{= kG}[ %{G}%H %{g}][%= %{= kw}%?%-Lw%?%{r}(%{W}%n*%f%t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= %{g}][%{B} %m/%d/%y %{W}%c %{g}]'

# lastly, add a window, dummy2
screen -d -r blah -X screen -t dummy2

A simple `screen -r blah` will show it worked well! I have a pretty hardstatus line that shows the hostname, windownames, and dates.


Now I want to wrap the screen commands into a Launch command...

test2.sh:
Code:
#!/bin/bash

Launch()
{
     local cmd=$1
     local res
 
     res=$($cmd)


    echo $res
}



# make a screen session named blah with a window named "dummy"
Launch "screen -dmS blah -t dummy"
# and give it a specific hardstatus line
Launch "screen -r blah -X hardstatus on"
Launch "screen -r blah -X hardstatus alwayslastline"
Launch "screen -r blah -X hardstatus string '%{= kG}[ %{G}%H %{g}][%= %{=  kw}%?%-Lw%?%{r}(%{W}%n*%f%t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= %{g}][%{B}  %m/%d/%y %{W}%c %{g}]'"

# lastly, add a window, dummy2
Launch "screen -d -r blah -X screen -t dummy2"

if you do a `screen -r blah`now...
Most everything worked - it created the "blah" screen session, and even created the "dummy" and "dummy 2" windows.. But look at the status line, its just a blank white bar!

what am I doing wrong? This is killing me!
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

im stuck! 'single quotes'

Hi all... This is probably the simplest question but its driving me round the bend :-( does anyone know how to store a single quote in a variable. Im using cygwin bash for example single_qoute = " ' " echo single_quote dosnt work :-( it is absolutely baffling me! The reason why... (4 Replies)
Discussion started by: satnamx
4 Replies

2. Shell Programming and Scripting

problem with single quotes in a string and findbug

I'm having trouble manipulating a string that contains single quotes (') in it. I'm writing a ksh script to parse in a few queries from a config file, such as this: findbug \(\(Project 'in' "Deployment,HDRCI,LHS,LSS,WUCI" '&&' Status 'in' "N" '&&' New_on 'lessthan' "070107" \)\) '&&' \(Class... (9 Replies)
Discussion started by: bob122480
9 Replies

3. Programming

Checking Single Quotes in C

Hi ! Can anyone please tell me how can I check if a character is single quotes in C ? Thanks, Jane A (3 Replies)
Discussion started by: janemary.a
3 Replies

4. Shell Programming and Scripting

Double quotes or single quotes when using ssh?

I'm not very familiar with the ssh command. When I tried to set a variable and then echo its value on a remote machine via ssh, I found a problem. For example, $ ITSME=itsme $ ssh xxx.xxxx.xxx.xxx "ITSME=itsyou; echo $ITSME" itsme $ ssh xxx.xxxx.xxx.xxx 'ITSME=itsyou; echo $ITSME' itsyou $... (3 Replies)
Discussion started by: password636
3 Replies

5. Shell Programming and Scripting

Problem renaming a file with single quotes

Hi, I am trying to create a script which validates the incoming source files. The script has File name Pattern as Argument. The First part of the script validates if there are any files available if then echo "\n Files are available to process \n" else echo "\n File does not... (9 Replies)
Discussion started by: dsshishya
9 Replies

6. Shell Programming and Scripting

Single quotes and double quotes

Hi guys, I have a sed line in double quotes which works fine, but I want it to be in single quotes here is the sed line sed "/abc_def/s/\'.*\'/\'\${abc_def}\'/" can some one give the equivalent to the above script in single quotes Thanks a ton (5 Replies)
Discussion started by: sol_nov
5 Replies

7. Shell Programming and Scripting

problem with echo inserting single quotes

Consider the following script: #!/bin/bash exclude='Archive PST,SystemState' IFS=$"," rsyncExclusions=$(for exclude in ${exclude}; do echo -n -e --exclude=\"${exclude}\"\ ; done) unset IFS echo rsync $rsyncExclusions test rsync -avh --delete --delete-excluded "$rsyncExclusions"... (7 Replies)
Discussion started by: jelloir
7 Replies

8. UNIX for Dummies Questions & Answers

grep single quotes or double quotes

Unix superusers, I am new to unix but would like to learn more about grep. I am very familiar with regular expressions as i have used them for searching text files in windows based text editors. Since I am not very familiar with Unix, I dont understand when one should use GREP with the... (2 Replies)
Discussion started by: george_vandelet
2 Replies

9. Shell Programming and Scripting

Replace single quote with two single quotes in perl

Hi I want to replace single quote with two single quotes in a perl string. If the string is <It's Simpson's book> It should become <It''s Simpson''s book> (3 Replies)
Discussion started by: DushyantG
3 Replies

10. Shell Programming and Scripting

Issue with Single Quotes and Double Quotes for prompt PS1

Hi, Trying to change the prompt. I have the following code. export PS1=' <${USER}@`hostname -s`>$ ' The hostname is not displayed <abc@`hostname -s`>$ uname -a AIX xyz 1 6 00F736154C00 <adcwl4h@`hostname -s`>$ If I use double quotes, then the hostname is printed properly but... (3 Replies)
Discussion started by: bobbygsk
3 Replies
SYSLOGOUT(8)						      System Manager's Manual						      SYSLOGOUT(8)

NAME
syslogout - modular centralized shell logout mechanism DESCRIPTION
syslogout is a generic approach to enable centralized shell logout actions for all users of a given system in a modular and centralized way mostly aimed at avoiding work for lazy sysadmins. It has only been tested to work with the bash shell. It basically consists of the small /etc/syslogout shell script which invokes other small shell scripts having a .bash suffix which are con- tained in the /etc/syslogout.d/ directory. The system administrator can drop in any script he wants without any naming convention other than that the scripts need to have a .bash suffix to enable automagic sourcing by the /etc/syslogout script. For shell sessions, the contents of /etc/syslogout.d/" will be sourced by every user at logout if the following lines are present in his $HOME/.bash_logout: if [ -f /etc/syslogout ]; then . /etc/syslogout fi If used for X sessions it is advisable to include the former statement into the Xreset script of the X display manager instead to prevent that closing of an terminal emulator window yields unexpected results in your running X session if your X11 terminal emulator is using a login shell. Be sure then to run it under the user-id of the X session's user. See the example files in /usr/share/doc/syslogout/ for illustration. Users not wanting /etc/syslogout to be sourced for their environment can easily disable it's automatic mechanism. It can be disabled by simply creating an empty file called $HOME/.nosyslogout in the user's home directory using e.g. the touch(1) command. Any single configuration file in /etc/syslogout.d/ can simply be overridden by any user by creating a private $HOME/.syslogout.d/ directory which may contain a user's own version of any configuration file to be sourced instead of the system default. It's names have just to match exactly the system's default /etc/syslogout.d/ configuration files. Empty versions of these files contained in the $HOME/.syslo- gout.d/ directory automatically disable sourcing of the system wide version. Naturally, users can add and include their own private scripts to be automagically executed by /etc/syslogout at logout time. OPTIONS
There are no options other than those dictated by shell conventions. Anything is defined within the configuration scripts themselves. SEE ALSO
The README files and configuration examples contained in /usr/share/doc/syslogout/ and the manual page for bash(1), xdm(1x), xdm.options(5), and wdm(1x). Recommended further reading is everything related with shell programming. If you need a similar mechanism for executing code at login time check out the related package sysprofile(8) which is a very close compan- ion to syslogout. BUGS
syslogout in its current form is mainly restricted to bash(1) syntax. In fact it is actually a rather embarrassing quick and dirty hack than anything else - but it works. It serves the practical need to enable a centralized bash configuration until something better becomes available. Your constructive criticism in making this into something better" is very welcome. Before i forget to mention it: we take patches... ;-) AUTHOR
syslogout was developed by Paul Seelig <pseelig@debian.org> specifically for the Debian GNU/Linux system. Feel free to port it to and use it anywhere else under the conditions of either the GNU public license or the BSD license or both. Better yet, please help to make it into something more worthwhile than it currently is. SYSLOGOUT(8)
All times are GMT -4. The time now is 10:31 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy