6-字符串篇

字符串截取

#!/bin/bash hostname="cat.host_name is cat.super.com" string=${hostname:3} echo $string string1=${hostname%.*} string2=${hostname%%.*} string3=${hostname#*.*} echo $string1 echo $string2 echo $string3 exit 0

获取长度

#!/bin/bash book="This is a script's book" size=${#book} size2=$(expr length "$book") echo $size echo $size2 exit 0

流重定向

#!/bin/bash FROM='from:root@cat.super.com' TO='to:cat@cat.super.com' SUBJECT='subject:shell script' MESSAGE='This is bash shell script' F_NAME='linux_shell' cat > $F_NAME << HERE $FROM $TO $SUBJECT $MESSAGE HERE exit 0