Advanced Bash−Scripting Guide

Advanced Bash−Scripting Guide
let "number += 1"
fi
done
if [ "$number" −eq "$ONE" ]
then
echo "$number file renamed."
else
echo "$number files renamed."
fi
# For correct grammar.
exit 0
# Exercises:
# −−−−−−−−−
# What type of files will this not work on?
# How can this be fixed?
#
# Rewrite this script to process all the files in a directory
#+ containing spaces in their names, and to rename them,
#+ substituting an underscore for each space.
Example A−4. blank−rename: renames filenames containing blanks
This is an even simpler−minded version of previous script.
#! /bin/bash
# blank−rename.sh
#
# Substitutes underscores for blanks in all the filenames in a directory.
ONE=1
number=0
FOUND=0
# For getting singular/plural right (see below).
# Keeps track of how many files actually renamed.
# Successful return value.
for filename in *
#Traverse all files in directory.
do
echo "$filename" | grep −q " "
# Check whether filename
if [ $? −eq $FOUND ]
#+ contains space(s).
then
fname=$filename
# Strip off path.
n=`echo $fname | sed −e "s/ /_/g"` # Substitute underscore for blank.
mv "$fname" "$n"
# Do the actual renaming.
let "number += 1"
fi
done
if [ "$number" −eq "$ONE" ]
then
echo "$number file renamed."
else
echo "$number files renamed."
fi
# For correct grammar.
exit 0
Example A−5. encryptedpw: Uploading to an ftp site, using a locally encrypted password
Appendix A. Contributed Scripts 370