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Break line after last "/" if length > X characters

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# 1  
Old 10-25-2008
Break line after last "/" if length > X characters
Hello.
I am a french newbie in unix shell scripting (sorry if my english speaking is wrong).
I have a file with path and filenames in it. I want to limit the number of characters on each line and break the line if necessary. But the "break" should occur after a slash caracter "/".

Example of input file
/home/xxxx/xxxx/xxxx/xxxx/
/home/xxxx/xxxx/xxxx/xxxx/yyyy/yyyy/yyyy/

Output file (limitation to 33 characters for instance)
/home/xxxx/xxxx/xxxx/xxxx/
/home/xxxx/xxxx/xxxx/xxxx/yyyy/
yyyy/yyyy/

I already managed to do it with a awk script of about 10-12 lines with a while loop and a field separator "/" (sorry I don't have the code here). The thing works but I am sure it could have been done in a more easy and efficient way.

Have you any ideas ? Any help would appreciated.
Thanks.
# 2  
Old 10-25-2008
You can try this if you don't have any spaces in the file:

Code:
tr '/' ' ' < file | fold -s -w 33 | tr ' ' '/'

Regards
# 3  
Old 10-25-2008
Thanks for your answer Franklin52.
In fact it is a bit more complicated than that.

My exact input file looks like :
Code:
text
text
ASSIGN var1='path/xxx/xxx/xxx/xxx/filename1'
ASSIGN var2='path/yyy/yyy/yyyyyyy/yyyy/y/yyyyyy/yyyy/filename2'
ASSIGN var3='path/zzzzzz/zzzzzzzzzz/zzzzzzzzzzz/filename3'
text
text

I only want to break lines beginning with 'ASSIGN' and with more than 50 characters.
Last edited by SportBilly; 10-25-2008 at 09:06 AM..
# 4  
Old 10-25-2008
And what should be the desired output (given your sample)?
# 5  
Old 10-25-2008
The output should be :
Code:
text
text
ASSIGN var1='path/xxx/xxx/xxx/xxx/filename1'
ASSIGN var2='path/yyy/yyy/yyyyyyy/yyyy/y/yyyyyy/
yyyy/filename2'
ASSIGN var3='path/zzzzzz/zzzzzzzzzz/zzzzzzzzzzz/
filename3'
text
text

# 6  
Old 10-25-2008
Code:
sed '/^ASSIGN.\{44\}/s|.\{1,50\}/|&\
|' file

An example (often the embedded new line is not obvious):

Code:
bash-2.03$ cat file
text
text
ASSIGN var1='path/xxx/xxx/xxx/xxx/filename1'
ASSIGN var2='path/yyy/yyy/yyyyyyy/yyyy/y/yyyyyy/yyyy/filename2'
ASSIGN var3='path/zzzzzz/zzzzzzzzzz/zzzzzzzzzzz/filename3'
text
text
bash-2.03$ sed '/^ASSIGN.\{44\}/s|.\{1,50\}/|&\
|' file
text
text
ASSIGN var1='path/xxx/xxx/xxx/xxx/filename1'
ASSIGN var2='path/yyy/yyy/yyyyyyy/yyyy/y/yyyyyy/
yyyy/filename2'
ASSIGN var3='path/zzzzzz/zzzzzzzzzz/zzzzzzzzzzz/
filename3'
text
text

Last edited by radoulov; 10-25-2008 at 09:26 AM.. Reason: corrected ...
# 7  
Old 10-25-2008
Thanks for your answer.
I don't have Unix at home so I cannot test your solution.
I'll test it as soon as i get to work on Monday.
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