Shell Programming and Scripting

Shell : Ksh (KSH_VERSION='@(#)PD KSH v5.2.14 99/07/13.2')
O.S : Linux (2.6)
Find version : GNU find version 4.2.27
ls version : ls (GNU coreutils) 5.97


Structure : I have 1000 folders (with small variation, for example folder1 - folder1000)
in each folder I have another folder (out)
in "out" I have something like 200 or more files (every folders have the same files).

I want to select "myFile"only if the modification time is lesser than 1month then concatenate all these files..

Find solution

Code:

find / -maxdepth 3 -regex "/folder[0-1000]/out/myfile" -ctime -31 -execdir cat {} \;

ls solution (1month = 31*24*3600=2 678 400 seconds )

Code:

ls -l --time-style=+%s /folder[0-1000]/out/myfile| awk -v current=`date "+%s"` -v threshold="2 678 400" ' { if ( (current-$6) < threshold ) { print $7 } } ' | xargs cat

Use -mtime in find (not -ctime).
Your find is using parameters not seen in unix. Perhaps someone with a similar O/S can check them?
The find posted looks like it does a find from root not from a sensible start point (which could take ages to run). What are you actually trying to do and what is the top-level directory structure?