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sed - extract string before "/" from variable- linux 2.6.9-89

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# 1  
Old 03-10-2010
sed - extract string before "/" from variable- linux 2.6.9-89
Hi,

I have a FTP script which gets called from a wrapper script that exports a variable having value as:

"/export/home/dips/logs/dipsSFTP_file1.log.YYYYMMDDHHMISS". I want to extract the file name "dipsSFTP_file1.log.YYYYMMDDHHMISS" and the dir path "/export/home/dips/logs/" from this variable separately.

I could extract the file name using:

Code:
 echo "/export/home/dips/logs/dipsSFTP_file1.log.YYYYMMDDHHMISS" | sed 's/.*\/\(.*\)/\1/'

but was not able to extract the dir path. Can you provide me the sed command which can do so?

Thanks in advance.
-dips
# 2  
Old 03-10-2010
try:
Code:
basename /export/home/dips/logs/dipsSFTP_file1.log.YYYYMMDDHHMISS
dirname /export/home/dips/logs/dipsSFTP_file1.log.YYYYMMDDHHMISS

# 3  
Old 03-10-2010
Hi, dips_ag:

You can just use the basename and dirname commands for this.
Code:
$ basename "/export/home/dips/logs/dipsSFTP_file1.log.YYYYMMDDHHMISS"
dipsSFTP_file1.log.YYYYMMDDHHMISS

$ dirname "/export/home/dips/logs/dipsSFTP_file1.log.YYYYMMDDHHMISS"
/export/home/dips/logs

If you're using a reasonably modern posix-compatible shell, you could also use its parameter expanding features:
Code:
$ var="/export/home/dips/logs/dipsSFTP_file1.log.YYYYMMDDHHMISS"

$ echo "${var##*/}"
dipsSFTP_file1.log.YYYYMMDDHHMISS

$ echo "${var%/*}"
/export/home/dips/logs

Please be aware the above shell parameter expansion approaches are not even close to being general purpose substitutes for basename and dirname; they just work for this particular case.
Last edited by alister; 03-10-2010 at 09:34 AM..
# 4  
Old 03-10-2010
Thanks anchal & alister. Both of your solutions worked!

-dips
# 5  
Old 03-10-2010
You're welcome, dip_ag.

In case you're still interested in the sed case, for that particular path you can extract the dirname with:
Code:
$ echo $var | sed 's/\/[^\/]*$//'
/export/home/dips/logs

... or, using a different regular expression delimiter to avoid having to escape forward slashes in the pattern ...
Code:
$ echo $var | sed 's|/[^/]*$||'
/export/home/dips/logs

Also, your filename SED can be simplified from
Code:
 sed 's/.*\/\(.*\)/\1/'

to
Code:
sed 's/.*\///'

or with a different delimiter to
Code:
sed 's|.*/||'

Please be aware the above SED commands are not even close to being general purpose substitutes for basename and dirname; they just work for this particular case.

Hope that helps,
Alister
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