bash - find oldest file from list -

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i've file list of files in different directories , want find oldest one. feels should easy shell scripting don't know how approach this. i'm sure it's easy in perl , other scripting languages i'd know if i've missed obvious bash solution.

example of contents of source file:

/home/user2/file1   /home/user14/tmp/file3   /home/user9/documents/file9 

#!/bin/sh  while ifs= read -r file;     [ "${file}" -ot "${oldest=$file}" ] && oldest=${file} done < filelist.txt  echo "the oldest file '${oldest}'"

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