Help assembling script

stumpyuk · #1 (**permalink**) 10-15-2008

I am trying to figure out how to write a bash script to process a file in order to make it more user readable. The file to be processed is quite uniform, every line starts with a 32 bit Unix timestamp in hexadecimal format, then a single tab charcter (0x09) then a string of text.
What I want to do is replace the hexadecimal epoch timestamp with a human readable time stamp. My plan is to first convert and substitute the hexadecimal to decimal then convert and substitute that with human readable time stamp. I have worked out how to do each step but not how to draw it all together.
To convert the hexadecimal to decimal I have come up with

Code:

for hexa in `cat input.txt | awk '{ print $1}'` ; do perl -e '${$deci=0x'$hexa'};print "$deci\n"' ; done

Then to convert the decimal to human readable is simply:

Code:

date -d @$deci

I want to be able to execute the script with the input filename as the argument. I guess I need to use sed or awk? I am not great with these commands just yet, so any help would be greatly appreciated.

TIA

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