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Making bash script from bash script

Posted on 2003-12-02
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813 Views
Last Modified: 2010-04-22
Dear experts.

I'm having problem making a bash script from another bash script.

The script I want to make is:
======================
#!/bin/sh
if [ ! -x "/opt/kde/bin/startkde" ]; then
   export PATH="$PATH:$opt/kde/bin"
fi
======================

The script that make that script is
======================
#!/bin/sh

# set the variables
PREFIX=/opt/kde  
SCRIPT=/etc/profile.d/kde.sh

# make the script
echo "#!/bin/sh" > $SCRIPT
echo "if [ ! -x \"$PREFIX/bin/startkde\" ]; then" >> $SCRIPT
echo "     export PATH=\"$PATH:$PREFIX/bin\"" >> $SCRIPT
echo "fi" >> $SCRIPT
======================

The result I got was not right, since the $PATH is always expanded to the env variables.
How to prefent it ?


Thanks.


0
Comment
Question by:Kocil
  • 3
  • 2
6 Comments
 
LVL 45

Expert Comment

by:sunnycoder
ID: 9864588
use single quotes for quoting your script ...
$ gets expanded in double quotes but not single quotes
0
 
LVL 45

Assisted Solution

by:sunnycoder
sunnycoder earned 75 total points
ID: 9864608
#!/bin/sh

# set the variables
PREFIX=/opt/kde  
SCRIPT=/etc/profile.d/kde.sh

# make the script
echo '#!/bin/sh' > $SCRIPT
echo 'if [ ! -x \"$PREFIX/bin/startkde\" ]; then' >> $SCRIPT
echo '     export PATH=\"$PATH:$PREFIX/bin\"' >> $SCRIPT
echo 'fi' >> $SCRIPT
0
 
LVL 7

Accepted Solution

by:
glassd earned 125 total points
ID: 9865032
If you are using Bash then you can make the whole thing a bit neater.

{
echo '#!/bin/sh'
echo 'if [ ! -x \"$PREFIX/bin/startkde\" ]; then'
echo '     export PATH=\"$PATH:$PREFIX/bin\"'
echo 'fi'
} > $SCRIPT

or:

echo '#!/bin/sh
if [ ! -x \"$PREFIX/bin/startkde\" ]; then
     export PATH=\"$PATH:$PREFIX/bin\"
fi' > $SCRIPT

The first method allows you to include any command output, not just that from the "echo" command.
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LVL 5

Author Comment

by:Kocil
ID: 9865156
Dear sunny.
The output from your script was

#!/bin/sh
if [ ! -x \"$PREFIX/bin/startkde\" ]; then
     export PATH=\"$PATH:$PREFIX/bin\"
fi

But i think I got the idea.
0
 
LVL 45

Expert Comment

by:sunnycoder
ID: 9865194
Oh ... just noticed what you wanted is slightly different

#!/bin/sh

# set the variables
SCRIPT=/etc/profile.d/kde.sh

# make the script
echo '#!/bin/sh' > $SCRIPT
echo 'PREFIX=/opt/kde' >> $SCRIPT
echo 'if [ ! -x \"$PREFIX/bin/startkde\" ]; then' >> $SCRIPT
echo '     export PATH=\"$PATH:$PREFIX/bin\"' >> $SCRIPT
echo 'fi' >> $SCRIPT
0
 
LVL 5

Author Comment

by:Kocil
ID: 9865216
Glassd, unfortunatelly my script is for a slack package,
so I have to use the spec (sh / ash).

But this seems to works for me

# make the script
echo '#!/bin/sh
if [ ! -x startkde ]; then
    export PATH="$PATH:$PREFIX/bin"
fi' > $SCRIPT

Thanks for both of you.

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