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extracting substring from a file name

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# 1  
Old 12-30-2008
extracting substring from a file name
hi

i need to name a file with a substring of a another file name.

i.e. if the old filename is abc.txt , the new filename should be abc_1.txt
i should get the substring of the file name and then name the new one

please let me know how to do it
# 2  
Old 12-30-2008
Try this:
Code:
#!/bin/sh
F=abc.txt
F1="${F%.*}_1.${F##*.}"
echo "F1=$F1"

The "%.*" (percent period asterisk) strips off exactly one period and the remaining characters from the end.
The "##*." (pound pound asterisk period) strips off all characters up to the last period plus the period from the front.
# 3  
Old 12-30-2008
try this out

HTML Code:
t1=`basename $0 .txt`
t2=${t1}_1.txt
echo "new file name:-${t2}"
# 4  
Old 12-30-2008
thanks a lot !!!!
its working
# 5  
Old 12-30-2008
Another way ...
Code:
$ F=abc.txt
$ F1=${F/\./_1\.}
$ echo $F1
abc_1.txt

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