ex52.sh

Shall高级编程

#!/bin/bash
# Uudecodes all uuencoded files in current working directory.

lines=35        # Allow 35 lines for the header (very generous).

for File in *   # Test all the files in $PWD.
do
  search1=`head -n $lines $File | grep begin | wc -w`
  search2=`tail -n $lines $File | grep end | wc -w`
  #  Uuencoded files have a "begin" near the beginning,
  #+ and an "end" near the end.
  if [ "$search1" -gt 0 ]
  then
    if [ "$search2" -gt 0 ]
    then
      echo "uudecoding - $File -"
      uudecode $File
    fi  
  fi
done  

#  Note that running this script upon itself fools it
#+ into thinking it is a uuencoded file,
#+ because it contains both "begin" and "end".

#  Exercise:
#  --------
#  Modify this script to check each file for a newsgroup header,
#+ and skip to next if not found.

exit 0