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How i can obtain differents data on a single pass?

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Top Forums Shell Programming and Scripting How i can obtain differents data on a single pass?
# 8  
Old 02-14-2012
Quote:
After more then one hour of search on that follow command:
Code:
sed -n "s/^${1}=//p" $2 2> /dev/null

i don't understand why use the symbol { and } over the first parameter.
You're looking for something too specific.

{ } work when substituting any shell variable in any context shell variables can be substituted in. It's normal syntax, and the safe way to do substitution, because it's less ambiguous. Would $var1_$var2 substitute $var1 or $var1_ ? The latter, to prevent that you'd do ${var1}_${var2}.
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alexscript
# 9  
Old 02-14-2012
I think that now i understand (at least about the { } ).
What about the final 2?
What means?
# 10  
Old 02-14-2012
Quote:
Originally Posted by alexscript
I even make an attempt on test of the sed outside the script but i don't known where i made a mistake:

$ sed -e "s/^{Name}=//p" /usr/share/applications/firefox.desktop
Naturally using -n i don't have output so i used e.
Yes -n causes nothing to print unless a /p is used this ensures only the line with your paramter is printed, to test from command try:

Code:
$ sed -n "s/^Name=//p" /usr/share/applications/firefox.desktop

This User Gave Thanks to Chubler_XL For This Post:
alexscript
# 11  
Old 02-15-2012
What means the last 2?
If i put 1 a receive an output with empty variable:
Code:
 Entry = "" { Actions = "Exec " }

while if i put 2 or more i receive the correct output.

---------- Post updated at 10:12 AM ---------- Previous update was at 07:33 AM ----------

During the test i find some particular .desktop.

Quote:
[Desktop Entry]
Name=DeaDBeeF
Exec=deadbeef %F
Categories=AudioVideo;Player;GTK;
Icon=deadbeef


[Play Shortcut Group]
Name=Play
Exec=deadbeef --play
TargetEnvironment=Unity

[Pause Shortcut Group]
Name=Pause
Exec=deadbeef --pause
TargetEnvironment=Unity

[Stop Shortcut Group]
Name=Stop
Exec=deadbeef --stop
TargetEnvironment=Unity

[Next Shortcut Group]
Name=Next
Exec=deadbeef --next
TargetEnvironment=Unity

[Prev Shortcut Group]
Name=Prev
Exec=deadbeef --prev
TargetEnvironment=Unity
That produce:
Code:
Entry = "DeaDBeeF
Play
Pause
Stop
Next
Prev" { Actions = "Exec deadbeef %F
deadbeef --play
deadbeef --pause
deadbeef --stop
deadbeef --next
deadbeef --prev" }

How is possible stop the search when the first occurrence is find on the file?
Code:
#!/bin/bash
 
function param_val {
    sed -n "s/^${1}=//p" $2 2> /dev/null
}
 
echo "Dynamic {" 
for i in `ls -c1 /usr/share/applications`
do
    CF=/usr/share/applications/$i
    name=$(param_val Name $CF)
    executable=$(param_val Exec $CF)
    icon=$(param_val Icon $CF)
    categories=$(param_val Categories $CF | cut -d\; -f1)
    echo " Entry = \"$name\" { Actions = \"Exec $executable\" }"
done
echo "}"

So only for the first block?
Quote:
Name=DeaDBeeF
Exec=deadbeef %F
Categories=AudioVideo;Player;GTK;
Icon=deadbeef
Here i read that using the q is possible quit before but i don't known how implement it.


$ sed -n "s/^Name=//p" /usr/share/applications/deadbeef.desktop
Code:
DeaDBeeF
Play
Pause
Stop
Next
Prev

Last edited by alexscript; 02-15-2012 at 05:40 AM..
# 12  
Old 02-15-2012
This function should be closer to what you want - It stops at the first occurance.

Code:
function param_val {
    awk "/^${1}=/{gsub(/^${1}="'/,""); print; exit}' $2
}

eg:
Code:
$ awk '/^Name=/{gsub(/^Name=/,""); print; exit}' /usr/share/applications/deadbeef.desktop
DeaDBeeF

This User Gave Thanks to Chubler_XL For This Post:
alexscript
# 13  
Old 02-16-2012
Code:
#!/bin/bash

function param_val {
    awk "/^${1}=/{gsub(/^${1}="'/,""); print; exit}' $2
}
 
echo "Dynamic {" 
for CF in `ls -c1 /usr/share/applications/*.desktop`
do
    name=$(param_val Name $CF)

    executable=$(param_val Exec $CF)

    icon=$(param_val Icon $CF)

    categories=$(param_val Categories $CF | awk -F ";" '{print $1}')

    echo " Entry = \"$name\" { Actions = \"Exec $executable\" }"

done
echo "}"

I replace:
categories=$(param_val Categories $CF | cut -d\; -f1)
with:
categories=$(param_val Categories $CF | awk -F ";" '{print $1}')
for remove the dependency with the command line cut.

This is the first release with some minor adjustment.

Thanks for the help. Smilie
Last edited by alexscript; 02-17-2012 at 05:25 AM.. Reason: minor correction
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