Shell Programming and Scripting

Hi Unix Gurus,

I have a requirement to create a filename in the following format:

file.out_1_mmddyyyyhhmiss (0 to 3 hrs)
file.out_2_mmddyyyyhhmiss (4 to 7 hrs)
file.out_3_mmddyyyyhhmiss (8 to 11 hrs)

I tried,
1)touch file.out_`date '+%m%d%Y%H%M%S'`
2)expr `date +%H` / 4 + 1

problem came when I linked the above commands
touch file.out_(expr `date +%H` / 4 + 1)_`date '+%m%d%Y%H%M%S'`

Please advise me how to link above two commands.

Fixing your existing command...

Code:

touch file.out_`expr \`date +%H\` / 4 + 1`_`date '+%m%d%Y%H%M%S'`

Back-ticks within back-ticks need escaping....dirty, right?

This is a bit better.

Code:

touch file.out_$(expr $(date +%H) / 4 + 1)_$(date '+%m%d%Y%H%M%S')

Hi elixir_sinari,

Wow it works! Thank you very much for your help.