Use of curly braces with variables


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Use of curly braces with variables
# 1  
Old 03-05-2008
Use of curly braces with variables

Hi,
I am new to shell scripting.I have worked somewhat with Perl though.
I am not able to find what the second line does and how does it do.

<code>
FP_RUNNING=`service filepool status`
FP_RUNNING=${FP_RUNNING%% *}
<\code>

After the first line,the variable FP_RUNNING stores '1 FilePool software is running.' If I print its value now,that is what it prints.But after executing the second line the variable holds '1'. I have searched the web for this kind of usage and syntax but could not find.Please help me.

Thanks in advance.
# 2  
Old 03-05-2008
Re:

Hi,

${string%substring}

Delete the match more longest than find from substr into string. This match goes from begin of the string to the end.

In your case, i think, it find in the string the first blank space and delete all until the end of the string

Sorry for my english...
# 3  
Old 03-05-2008
${FP_RUNNING%% *}

deletes spaces (indicated by ' *') from the end of ${FP_RUNNING}.

Code:
${name%%pattern}
    If pattern matches the end of the value of parameter name,
    the matched text is deleted from the result of substitution.

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Check string end with curly braces

file.txt apple apples{ applepicture apple9 apple cake{ abple apple_and_cake appleapple apple apple( and my script while read line; do if ]; then echo "$line" fi done <file.txt read (10 Replies)
Discussion started by: cmdcmd
10 Replies

2. Shell Programming and Scripting

When curly braces needed?

Hello, i was trying to find get a command to list duplicated files so i tried ls dir1 dir2 | awk '{x++}' and it didnt work. After a bit of searching online i found that it works without the curly braces ls dir1 dir2 | awk 'x++' I thought the curly braces were needed in awk so... (6 Replies)
Discussion started by: andy391791
6 Replies

3. Shell Programming and Scripting

Curly braces in sed

Hi, I have below command in one of the script. Can you please let me know what does the curly braces do over here \{1,\}. The remaining part of the code atleast I am able to understand. sed -n 's/.*\-\()\{1,\}\)\-.*/\1/p' (13 Replies)
Discussion started by: tostay2003
13 Replies

4. Shell Programming and Scripting

How to remove newline, tab, spaces in curly braces.. :( Pls Help?

Hi Everyone, in the below "xyz (Exception e)" part... after the curly braces, there is a new line and immediately few tabs are present before closing curly brace. xyz (Exception e) { } note: there can be one or more newlines between the curly braces. My desired output should be ... (6 Replies)
Discussion started by: NY_777
6 Replies

5. Shell Programming and Scripting

** EMERGENCY ** Having trouble with curly braces.. :( Pls Help

Hi Everyone, in the below "xyz (Exception e)" part... after the curly braces, there is a new line and immediately few tabs are present before closing curly brace. xyz (Exception e) { } note: there can be one or... (1 Reply)
Discussion started by: NY_777
1 Replies

6. UNIX for Dummies Questions & Answers

How do I pull the value between curly braces?

Hi everyone, I've got a file that looks like this: uid{508}pid{22224}pname{/PPROGRAM/pprgramx -profile:LIVE -serv:as ... I want to pull the value of pid between the curly braces, or 22224 in this example. pid is always the second pair of curly braces, but the length of the number is... (7 Replies)
Discussion started by: Scottie1954
7 Replies

7. Shell Programming and Scripting

tar --exclude with curly braces

I'm having trouble understanding the exclude option in tar. From some web sites, it seems one is able to exclude several strings by enclosing them in curly brackets. However it seems to be "random" what gets excluded when using the curlies. I've been using the exclude-from=myfile option in a... (12 Replies)
Discussion started by: majest
12 Replies

8. Shell Programming and Scripting

sed in windows does not parse curly braces

Hi everyone: I'm stuck at this point, could you guys please give me some hints about what I am doing wrong in the following script, I'm using sed for windows: sed ^"$ {^ a^ STRINGTABLE DISCARDABLE^ BEGIN^ #define CLIENT_MODULE, "%CLIENT_MODULE%"^ #define CLIENT_ID, "%CLIENT_ID%"^... (1 Reply)
Discussion started by: edgarvm
1 Replies

9. Shell Programming and Scripting

find -regex not recognizing curly braces

Must be a bug or something. Whether I escape them or not, it will not work. No matter what I set the minimum and maximum to nothing gets caught. For instance: find / -regex "/.{0, 50}.*" -maxdepth 1 or find / -regex "/.\{0, 50\}.*" -maxdepth 1 should pretty much catch everything residing within... (4 Replies)
Discussion started by: stevensw
4 Replies

10. Shell Programming and Scripting

Curly braces assigned to variables

Hi, Im pretty new to Unix. I came across a script which was using PLSQL inside a script and there was an unusual thing mentioned. there was a variable assigned as P_CUR=${1} and one more as V_TAGFILE="$1" Couldnt find the difference. Also the variables were used in PLSQL... (1 Reply)
Discussion started by: njks68
1 Replies
Login or Register to Ask a Question