1 字符串的更具字符分割
1） xargs分割
echo "chenyu*hello*word" | xargs -d "*" chenyu hello word
2） awk分割
echo "chenyu*hello*word" | awk -F "*" '{print $1}' chenyu
2 字符串的删除字符
1）用tr命令
1. echo "chenyu ni hao ya" | tr -d 'y' 2. chenu ni hao a
2）用sed命令
1. echo "hello*word*word" | sed 's/*//g' 2. hellowordword
3 文本内容的删除
用sed命令
cat 1.txt chenyu nihao hello word chenyu nihao dongma sed -i '/chenyu/d' 1.txt cat 1.txt nihao hello word nihao dongma
4 grep -q 用于if逻辑判断
-q 参数，本意是 Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected. 中文意思为，安静模式，不打印任何标准输出。如果有匹配的内容则立即返回状态值0
自己测试如下
#/bin/bash value="chenyu ni hao ya" #匹配成功执行$?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" fi if echo $value | grep -q "hao"; then echo "second success" else echo "second fail" fi
允许结果如下：
1. ./grep.sh 2. 0 3. 1 4. first fail 5. second success
5 grep -i（忽略大小写）来判断结果
#/bin/bash value="chenyu" echo $value | grep -i "chen" > /dev/null if [ $? -eq 0 ]; then echo "grep success" else echo "grep fail" fi echo $value | grep -i "chengongyu" > /dev/null if [ $? -eq 0 ]; then echo "grep success" else echo "grep fail" fi
运行结果
1. grep success 2. grep fail
