Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

$ variable resolution problem

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting $ variable resolution problem
# 1  
Old 07-09-2009
$ variable resolution problem
We have the following code

Code:
filename=`head -1 $filelist`
if [ ! -f $filename ]
then
 touch $filename
fi

filelist contains the below items.
Code:
${HOME}/file1
${TEST_DIR}/file2
.
.

The output of the script described above is
${HOME} not found

The $ variables given inside the file list are not getting resolved.

Is it that the variables are not available as the script runs in a shell or something like that?
# 2  
Old 07-09-2009
Use eval in front of touch. Existence of files is tested with -e not -f if that is what you want to do. And make sure $filelist is defined somewhere cause I could not see it.
# 3  
Old 07-09-2009
Thanks a lot! Using eval in front of touch worked.

Can you please explain the use of eval in this context?
# 4  
Old 07-09-2009
Echoing $filename should show you just the path without substitution of $HOME.

Era has a good description here:
https://www.unix.com/shell-programmin...scripting.html

The forum has a superb search function Smilie
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Variable resolution in File content

I have a file File1 containing lines like below apple ${FRUIT}-Color orange ${FRUIT}-Color banana ${FRUIT}-Color Now, in my shell I'm reading the file like below while read FRUIT DESC; do echo $FRUIT $DESC; done < File1 which outputs - apple ${FRUIT}-Color orange ${FRUIT}-Color... (3 Replies)
Discussion started by: nexional
3 Replies

2. Red Hat

Screen Resolution Persistence Problem: RHEL 6.3

Good morning everyone, I have been having screen resolution issues with RHEL 6.3. Our current setup is a laptop connected to a KVM/IP server. This is the desired scenario: RHEL laptop Windows XP laptop KVM/IP server The RHEL laptop has the file /etc/gdm/Init/Default populated with... (3 Replies)
Discussion started by: rchaud10
3 Replies

3. Debian

Xorg resolution/display size problem

Hello, I am running Debian 6.0 on a Sun Ultra 5 and the openbox window manager. The window is way larger than the screen and minimized icons go off the screen and I can't get them back. The mode is set to 1280x1024 in the Screen section of xorg.conf and Virtual is also set to 1280x1024 which is... (4 Replies)
Discussion started by: snorkack59
4 Replies

4. Shell Programming and Scripting

problem in assigning value to variable have value fo other variable

my script is some thing like this i11="{1,2,3,4,5,6,7,8,9,10,11,}" echo "enter value" read value ..............suppose i11 x="$value" echo "$($value)" .............the echo should be {1,2,3,4,5,6,7,8,9,10,11,} but its showing "i11" only. plz help me out to get desired... (10 Replies)
Discussion started by: sagar_1986
10 Replies

5. Shell Programming and Scripting

Problem with a variable withing a variable

hello there, basically im screwed with a variable that should take the last modification date of a file. my code is fileCreationTime=$(( `ls -l $fileName | tr -s " " | cut -d " " -f6` )) my problem arise coz when the code is executed and stored in a file the return value is 1993 and not... (4 Replies)
Discussion started by: thurft
4 Replies

6. Solaris

OpenWindows display resolution problem

Hi all! On my SPARC mashine I have changed the screen resolution from default to: output-device screen r1024x768x75, because the OBP picture too big (e.g. Sun Logo and OBP text). Now, after the system booting I have the problem with OpenWindows picture (e.g. the window manager does not display... (2 Replies)
Discussion started by: wolfgang
2 Replies

7. Debian

Change resolution problem

Hi gurus I have notebook with connected external monitor. output of my xrandr looks like Screen 0: minimum 320 x 200, current 2960 x 1050, maximum 2960 x 1050 VGA connected 1680x1050+1280+0 (normal left inverted right x axis y axis) 478mm x 300mm 1680x1050 60.0*+ 1280x1024 ... (2 Replies)
Discussion started by: wakatana
2 Replies

8. Solaris

Screen Resolution problem on Ultra 10 with Solaris 10

Hi, I have a Sun Ultra 10 (SPARC) with Solaris 10 installed. The screen resolution is very poor and grainy which I have been unable to rectify. Every time I try to set the resolution I get the following: 'The XServer does not support the XRandR extension. Runtime resolution changes to the... (5 Replies)
Discussion started by: patcom
5 Replies

9. IP Networking

Problem with name resolution?

I have an AIX4.3 box on our subnet, called LIMEST3.OURDOMAIN.CO.UK, with IP address 10.103.1.13 It has the following entry in its own /etc/hosts: 10.103.1.13 limest3 limest3.ourdomain.co.uk Now, if I ping limest3.ourdomain.co.uk or ping 10.103.1.13, the result is instant. However if I ping... (4 Replies)
Discussion started by: grimbleshanks
4 Replies

10. UNIX Desktop Questions & Answers

Resolution..??

When i start my pc after the installation of suse linux it ask me for resolution but not for graphical interface, for console, can i run a command to change it again? Thanx! (3 Replies)
Discussion started by: Linux_fan
3 Replies
Login or Register to Ask a Question