6-字符串篇

字符串截取

#!/bin/bashhostname="cat.host_name is cat.super.com"string=${hostname:3}echo $stringstring1=${hostname%.*}string2=${hostname%%.*}string3=${hostname#*.*}echo $string1echo $string2echo $string3exit 0

获取长度

#!/bin/bashbook="This is a script's book"size=${#book}size2=$(expr length "$book")echo $sizeecho $size2exit 0

流重定向

#!/bin/bashFROM='from:[e-mail]'TO='to:[e-mail]'SUBJECT='subject:shell script'MESSAGE='This is bash shell script'F_NAME='linux_shell'cat > $F_NAME << HERE$FROM$TO$SUBJECT$MESSAGEHEREexit 0