Bash Guide for Beginners, chapter 4 solutions

grep bash /etc/passwd | cut -d: -f1

grep bash /etc/passwd | cut -d: -f1

grep "^daemon" /etc/group

grep "^daemon" /etc/group

grep --invert-match "^daemon" /etc/group

grep --invert-match "^daemon" /etc/group

grep -n localhost /etc/hosts

grep -n localhost /etc/hosts

grep -o localhost /etc/hosts |wc -w

grep -o localhost /etc/hosts |wc -w

cd /usr/share/doc
for file in *
do
	if grep "$file" /etc/shells > /dev/null
	then
		echo "$file"
	fi
done

cd /usr/share/doc for file in * do if grep "$file" /etc/shells > /dev/null then echo "$file" fi done

sum=0
for file in *
do
	if grep "$file" /etc/shells > /dev/null
	then
		sum=`expr $sum + $(find "$file" -name README |wc -l)`
	fi
done
echo $sum

sum=0 for file in * do if grep "$file" /etc/shells > /dev/null then sum=`expr $sum + $(find "$file" -name README |wc -l)` fi done echo $sum

find . -mtime 0.42 -type f
for file in *
do
	if [ `stat -c %Y "$file"` -gt `expr $(date "+%s") - 36000` ] && [ -f "$file" ]
	then
		echo "$file"
	fi
done

find . -mtime 0.42 -type f for file in * do if [ `stat -c %Y "$file"` -gt `expr $(date "+%s") - 36000` ] && [ -f "$file" ] then echo "$file" fi done

grep -c ".*" test

grep -c ".*" test

grep "^/dev" /etc/fstab | awk '{print $1}'
grep -o "^/dev[^[:space:]]*" /etc/fstab

grep "^/dev" /etc/fstab | awk '{print $1}' grep -o "^/dev[^[:space:]]*" /etc/fstab

user=rwh
if grep "^$user:" /etc/passwd > /dev/null
then
	echo user $user exists in the fstab
else
	echo user $user does not exist in the fstab
fi

user=rwh if grep "^$user:" /etc/passwd > /dev/null then echo user $user exists in the fstab else echo user $user does not exist in the fstab fi

cd /etc
ls |grep [0-9]
ls |grep "[[:digit:]]"

cd /etc ls |grep [0-9] ls |grep "[[:digit:]]"