#!/bin/bashfor i in 1 2 3 4 5do   echo "Welcome $i times"donefor i in $( ls ); do    echo item: $idonefor i in `seq 1 10`;do    echo $idonefor i in {1..5}do   echo "Welcome $i times"donefor (( c=1; c<=5; c++ ))do	echo "Welcome $c times..."donefor ((i=1; $i<=9;i++)); do echo $i; done

for i in {0..10..2}do    echo "Welcome $i times"donefor i in $(seq 1 2 20)do   echo "Welcome $i times"done

单行实例

for ip in {1..10};do echo $ip; donefor i in `seq 1 10`;do echo $i;donefor ip in {81..92}; do ssh root@172.16.3.$ip date; donefor n in  {23..32} {49,50} {81..92}; do mkdir /tmp/$n; echo $n; done

for keyword in bash cmd lsdo	echo $keyworddone string="aaa bbb ccc ddd" && for word in $string; do echo "$word"; done	files=( "/etc/passwd" "/etc/group" "/etc/hosts" )for file in "${files[@]}"do    echo $filedone

infinite loops

#!/bin/bashfor (( ; ; ))do   echo "infinite loops [ hit CTRL+C to stop]"done

find file

#!/bin/bashfor file in /etc/*do	if [ "${file}" == "/etc/resolv.conf" ]	then		countNameservers=$(grep -c nameserver /etc/resolv.conf)		echo "Total  ${countNameservers} nameservers defined in ${file}"		break	fidone

backup file

#!/bin/bashFILES="$@"for f in $FILESdo        # if .bak backup file exists, read next file	if [ -f ${f}.bak ]	then		echo "Skiping $f file..."		continue  # read next file and skip cp command	fi        # we are hear means no backup file exists, just use cp command to copy file	/bin/cp $f $f.bakdone

for n in  {23..32} {49,50} {81..92}; do mkdir /tmp/$n; echo $n; done

#!/bin/bashCOUNTER=0while [  $COUNTER -lt 10 ]; do    echo The counter is $COUNTER    let COUNTER=COUNTER+1done

while read name agedo	echo $name $agedone << EOFneo 30jam 31john 29EOFwhile read name agedo	[[ $age -gt 30 ]] && echo $namedone << EOFneo 30jam 31john 29EOF

$ cat mount.sh#!/bin/shwhile read LINEdo	s=`echo $LINE|awk '{print $1}'`	d=`echo $LINE|awk '{print $2}'`	umount -f $d	mount -t nfs4 $s $ddone < mount.conf$ cat mount.conf172.16.0.1:/	/www/logs/1172.16.0.2:/	/www/logs/2172.16.0.3:/	/www/logs/3172.16.0.4:/	/www/logs/4172.16.0.5:/	/www/logs/5

读一行

while IFS='' read -r line || [[ -n "$line" ]]; do	echo "Text read from file: $line"done < "$1"

#!/bin/bashCOUNTER=20until [  $COUNTER -lt 10 ]; do    echo COUNTER $COUNTER    let COUNTER-=1done