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Awk-sed help: removing extension name.

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# 1  
Old 06-06-2013
Awk-sed help: removing extension name.
Experts:

Filename:
Code:
 rp8-file.1.cr_cr.cr

I want to remove the extension .cr
I want to get the output as
Code:
rp8-file.1.cr_cr


Tried like this but not getting correct output:


Code:
echo "rp8-file.1.cr_cr.cr" | awk -F. '{$NF="";print $0}'
rp8-file 1 cr_cr

# 2  
Old 06-06-2013
Code:
echo "rp8-file.1.cr_cr.cr" | sed 's/\.[^.]*$//'

This User Gave Thanks to bartus11 For This Post:
rveri
# 3  
Old 06-06-2013
Team Thanks, I got it with this awk code with few try:

Code:
echo "p8-file.1.cr_cr.cr" | awk -F[.][c][r]$ '{print $1}'
p8-file.1.cr_cr

Please advise if this is correct way of using the
Code:
-F

field option in awk.
# 4  
Old 06-06-2013
Using awk:
Code:
echo "rp8-file.1.cr_cr.cr" | awk -F'.' '{NF-=1}1' OFS='.'

Using Parameter Substitution in shell:
Code:
filename="rp8-file.1.cr_cr.cr"
echo ${filename%.*}

# 5  
Old 06-06-2013
Quote:
Originally Posted by rveri
Experts:

Filename:
Code:
 rp8-file.1.cr_cr.cr

I want to remove the extension .cr
I want to get the output as
Code:
rp8-file.1.cr_cr


Tried like this but not getting correct output:


[CODE]echo "rp8-file.1.cr_cr.cr" | awk -F. '{$NF="";print $0}'
rp8-file 1 cr_cr
Yoda's suggestion is fine if you want to remove any filename extension. If you just want to remove .cr and leave other extensions as is, use:
Code:
Filename=rp8-file.1.cr_cr.cr
echo "${Filename%.cr}"

# 6  
Old 06-06-2013
You do not need awk for this and if you intend to fire up awk for this single purpose, like in your example, i suggest you do not do it: it will slow down your script considerably.

Use "parameter expansion" instead. Assuming you use either KornShell or bash this is how to remove an extension of ".cr" from a filename:

Code:
filename="something.cr"
echo ${filename%.cr}            # just output the new name, not changing anything
newname="${filename%.cr}"       # assign the new name to a variable

I hope this helps.

bakunin

/PS: seeing Don Craguns suggestion, here are some variants:

Code:
filename="something.cr"
echo ${filename%.??}            # removes any 2-character extension
echo ${filename%.???}           # like above, removes any 3-character extension
echo ${filename%.*}             # removes any extension, that is: from the rightmost "." to the end

I hope this helps.

bakunin
Last edited by bakunin; 06-06-2013 at 05:53 PM..
# 7  
Old 06-06-2013
Quote:
Originally Posted by bakunin
You do not need
... ... ...

Code:
echo ${filename%%.*}           # removes any extension, that is: from the rightmost "." to the end

I hope this helps.

bakunin
Not quite. With %%.* (instead of %.*), it will remove the first period and all characters that follow it; not the rightmost period to the end. For example:
Code:
Filename=rp8-file.1.cr_cr.cr
echo "${Filename%.*}"

produces:
Code:
rp8-file.1.cr_cr

but:
Code:
echo "${Filename%%.*}"

produces:
Code:
rp8-file
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