Bash Shell read file line by line and substring
#read one file line by line
for line in $(cat test1.txt);
do echo $line ;
done;
#while read split line by space
while read line
do
for word in $line
do echo $word
done;
done <test1.txt #string split or substring
input=type=abcdefg
echo $input;
#get abcdefg
echo $input | cut -d'=' -f
echo $input | cut -d'=' -f #${variable:startindex:len}
export str=""
output=${str::}
echo $output #${varible##*string} 从左向右截取最后一个string后的字符串
#${varible#*string} 从左向右截取第一个string后的字符串
#${varible%%string*} 从右向左截取最后一个string后的字符串
#${varible%string*} 从右向左截取第一个string后的字符串 #常用保留变量:
$HOME:当前用户的根目录路径
$PATH:PATH环境变量
$PWD:当前工作路径
$,$,$,…:第0个参数(shell脚本自身),第1个参数……
$RANDOM:-65536之间的整数 #大小写转换
HI=HellO
echo
"$HI"
# HellO
echo
${HI^}
# HellO
echo
${HI^^}
# HELLO
echo
${HI,}
# hellO
echo
${HI,,}
# hello
echo
${HI~}
# hellO
echo
${HI~~}
#hELLo
^大写,,小写, ~大小写切换
重复一次只修改首字母,重复两次则应用于所有字母
${
file
/dir/path
}:将第一个
dir
提换为 path:
/path1/dir2/dir3/my
.
file
.txt
${
file
//dir/path
}:将全部
dir
提换为 path:
/path1/path2/path3/my
.
file
.txt
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