Shell Programming and Scripting

Hi.,

My current script extracts only if the date and time are in 3rd and 4th pos.

Code:

 
#!/bin/bash
echo "Enter the file name to extract the timestamp"
read fname
IFILE=$fname
F=$IFILE
IFS="_."  
f=($F)    
echo "Date ${f[2]} Time ${f[3]}"

How to generalize the script to extract the fields regardless of its position.

Currently for my i/p file of format: ot_abc_20100406_041025.txt, it is working properly. And also my timestamp will be last 2 fields before the file extension starts.

So regardless of i/p file I want the script to extract the last to fields. Request you to suggest the solution.

Thank you.

You can do something like:

Code:

#!/bin/bash

echo "Enter the file name to extract the timestamp"
read fname

set `echo "$fname"| sed 's/.*_\(.*\)_\(.*\)\..*/\1 \2/'`
echo $1
echo $2

Hi.,

Thanks for your reply. The script is working properly.
Here can you tell me what set command is doing, as I am new to Shell scripting. And also how you are extracting last 2 fields using stream editor cmd?

Thank you.

From an excerption of man set:

For the sed command you can have a read of this:

Sed - An Introduction and Tutorial