Script to rename files

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# 1  
Old 01-21-2008
Script to rename files

Have files of the sort 3p1522015.dgn and need to have them renamed to 152201.dgn. Essentially dropping the 1st 2 characters and the last. I'm relatively new to UNIX and uncertain of where to start. I hope this provides enough detail.

# 2  
Old 01-21-2008
Easy to do using bash shell

bash-3.2$ filename="3p1522015.dgn"
bash-3.2$ echo $newfilename
bash-3.2$ newfilename=${filename:2:6}.dgn
bash-3.2$ echo $newfilename

# 3  
Old 01-21-2008

don't understand this line ? is this built into bash as i don't see a command...? even thought that was regular expression!

thanx in advance!
# 4  
Old 01-21-2008
try this ..

if your filenames are of fixed length and you just need to remove the first two chars and last char and rename it , then this might help,

team$ filename="3p1522015.dgn"
team$ basename $filename
team$ basename $filename | cut -c 3-8
team$ newfilename=`basename $filename | cut -c 3-8`.dgn
team$ echo $newfilename
team$ unset filename newfilename
# 5  
Old 01-22-2008
Originally Posted by stevie_velvet

don't understand this line ? is this built into bash as i don't see a command...? even thought that was regular expression!
Yes, this is bash syntax. It takes characters 2 through 6 of filename, appends ".dgn" and assigns it to newfilename. Google for bash regular expressions and you wish find a number of tutorials on the subject.
# 6  
Old 01-22-2008
it is worthy to learn such features of bash, at some situation bash can perform some operation very easily and efficiently compare to sed and awk.specially when you write a bash script you would prefer to use a bash inbuilt command than invoking some other tool or command

Rakesh UV
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