your problem is that the variables are not being expanded in the order you need. For exactly this is the 'eval' command, which restarts the interpretation process of the shell.
notice the difference:
The next to last line will first evaluate to "eval echo $myvar", then eval will restart the evaluation process resulting in "echo foo", which is in turn being displayed.
bakunin
Last edited by rbatte1; 12-13-2016 at 09:42 AM..
Reason: Added CODE tags
Hey All,
I'm trying to clean up a variable using sed but It dosn't seem to work. I'm trying to find all the spaces and replace them with "\ " (a slash and a space). For Example "Hello World" should become "Hello\ World". But it does nothing. If I put it directly into the command line it works... (3 Replies)
I have run into a wall with my iptables firewall scripting.
I am blocking all of the private side IP addresses on the
WAN interface on systems running NAT. However, if the
system is not running NAT and needs to allow access to
the local LAN on the WAN interface, I need to block all
but one of... (2 Replies)
Hi
I have a variable whose value is like this
i=/test/test1/test2/myfile.cd.070505123457
i would like to have the value of myfile.cd stored into another variable
my attempt is
test=${i##*/} ;echo $test ##and i get
myfile.cd.070505123457
since what i wnat is myfile.cd i try this... (19 Replies)
Hello,
I would like to dual subtitutes variables.
I tried
$serv="combo"
combo_TYPE="mop"
TYPENAME="$serv_TYPE"
Now, I'd like to get "mop" from TYPENAME
echo "${${TYPENAME}}"
I have a bad substitution error
:) (1 Reply)
Hello,
i have another sed question.. I'm trying to do variable substition with sed and i'm running into a problem.
my var1 is a string constructed like this:
filename1 filerev1 filepath1
my var2 is another string constructed like this:
filename2 filerev2 filepath2
when i do... (2 Replies)
Hi ,
I have a variable as follows,
Temp=`cat ABC.txt | cut -c5-`
This will yeild a part of the date. say , 200912.
I would like to substitute this variable's value in a filename.
eg: File200912F.zip
when i say File$TempF.zip , it is not substituting.
Any help ?
Thanks in... (2 Replies)
Hi,
I am generating html code using cshell, but i am having one problem while printing double quotes,
I need to write following code in file. where $var contains list of web address
<a href="$var">$var</a>
So i am using
echo "<a href="$var">$var</a>" > file.html
But with this " in... (4 Replies)
For example I have variable like below
echo $OUTPUT
/some/path/`uname -n`
when I try to use the variable OUTPUT like below
cd $OUTPUT or cd ${OUTPUT}
I am getting bad substituion error message
$ cd $OUTPUT
ksh: cd: bad substitution
$ cd ${OUTPUT}
ksh: cd: bad substitution
... (1 Reply)
$ ABCel='abc@gmail.com'
$ XYZel='xyz@gmail.com'
$ MYel='my@yahoo.com'
$ echo $ABCel
abc@gmail.com
$ echo $XYZel
xyz@gmail.com
$ echo $MYel
my@yahoo.com
I tried 3 variations, but not getting the expected result:
$ for VAR in ABC XYZ; do echo -e "${VAR}el $MYel"; done
ABCel... (1 Reply)
Discussion started by: bagnoble
1 Replies
LEARN ABOUT LINUX
shtool-subst
SHTOOL-SUBST.TMP(1) GNU Portable Shell Tool SHTOOL-SUBST.TMP(1)NAME
shtool-subst - GNU shtool sed(1) substitution operations
SYNOPSIS
shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
[-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]
DESCRIPTION
This command applies one or more sed(1) substitution operations to stdin or any number of files.
OPTIONS
The following command line options are available.
-v, --verbose
Display some processing information.
-t, --trace
Enable the output of the essential shell commands which are executed.
-n, --nop
No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.
-w, --warning
Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
operations resulted in no content change on all files.
-q, --quiet
Suppress warning on substitution operation resulting in no content change.
-s, --stealth
Stealth operation. Preserve timestamp on file.
-i, --interactive
Enter interactive mode where the user has to approve each operation.
-b, --backup ext
Preserve backup of original file using file name extension ext. Default is to overwrite the original file.
-e, --exec cmd
Specify sed(1) command directly.
-f, --file cmd-file
Read sed(1) command from file.
EXAMPLE
# shell script
shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]
# RPM spec-file
%install
shtool subst -v -n
-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g'
-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g'
`find . -name Makefile -print`
make install
HISTORY
The GNU shtool subst command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 2001 for GNU shtool. It was prompted
by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.
SEE ALSO shtool(1), sed(1).
18-Jul-2008 shtool 2.0.8 SHTOOL-SUBST.TMP(1)