1字符串的更具字符分割 1） xargs分割
echo "chenyu*hello*word" | xargs -d "*"
chenyu hello word2） awk分割
echo "chenyu*hello*word" | awk -F "*" '{print $1}'
chenyu2 字符串的删除字符 1）用tr命令
echo "chenyu ni hao ya" | tr -d 'y'
chenu ni hao a2）用sed命令
echo"hello*word*word" | sed 's/*//g'
hellowordword3 文本内容的删除 用sed命令
cat 1.txt
chenyu
nihao
hello
word
chenyu
nihao
dongma
sed -i '/chenyu/d' 1.txt
cat 1.txt
nihao
hello
word
nihao
dongma【linux shell之字符串的更具字符分割和删除字符和文本内容的删除以及内容是否匹配成功】
4 grep -q 用于if逻辑判断 -q 参数，本意是 Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected.中文意思为，安静模式，不打印任何标准输出。如果有匹配的内容则立即返回状态值0
自己测试如下
#/bin/bashvalue="https://www.it610.com/article/chenyu ni hao ya"#匹配成功执行$?返回0
echo "hello" | grep -q "he";
echo $?
#匹配失败执行$?非0
echo "hello" | grep -q "hehelodaf";
echo $?#如果能匹配成功那么就到then反之到else
if echo $value | grep -q "chenyuddsa";
then
echo "first success"
else
echo "first fail"
fiif echo $value | grep -q "hao";
then
echo "second success"
else
echo "second fail"
fi允许结果如下：
./grep.sh
0
1
first fail
second success
5 grep -i（忽略大小写）来判断结果
#/bin/bashvalue="https://www.it610.com/article/chenyu"
echo $value | grep -i "chen" > /dev/nullif [ $? -eq 0 ];
then
echo "grep success"
else
echo "grep fail"
fiecho $value | grep -i "chengongyu" > /dev/nullif [ $? -eq 0 ];
then
echo "grep success"
else
echo "grep fail"
fi运行结果
grep success
grep fail
