mysql中loop语句的使用 说明 1、loop实现了一个简单的循环,退出循环的条件需要用其他语句定义,通常可以使用leave语句实现。...2、若没有为statement_list添加退出循环的语句,则loop语句可用于实现简单的死循环。...实例 `[begin_label:] LOOP statement_list END LOOP [end_label]` 以上就是mysql中loop...
for bash 原创 ggvylf 2015-01-20 22:25:16 1443阅读 bash脚本:if循环 单分支的if语句: if 判断条件; then statement1 statement2 ... fi 例如: 如果用户已存在,则显示已存在 #!/bin/bashNAME = TEST if id $NAME &> /dev/null ; then echo "user exists" fi 双分支的if语句: if 判断条件; th...
问在bash中使用内联if-statement添加命令参数ENexport export命令将会使得被 export 的变量在运行的脚...
bash shell if-statement while-loop m3u 我正在编写一个脚本来解析m3u文件。目标是检索变量标记和url。我用这个文件做了测试。 #!/bin/bash echo "name,tvg-id,tvg-name,tvg-country,group-title,languages,url" while IFS= read -r line; do tags_detect="$(echo "$line" | grep -Eo '^#EXTINF:')...
statements. They're different names for the same thing. Related:9 Examples of for Loops in Linux Bash Scripts Theifstatement says that if something is true, then do this. But if the something is false, do that instead. The "something" can be many things, such as the value of a variab...
Use if statement in bash Let's create a script that tells you if a given number is even or not. Here's my script namedeven.sh: #!/bin/bash read -p "Enter the number: " num mod=$(($num%2)) if [ $mod -eq 0 ]; then ...
If statement and else statement could be nested in bash. The keyword “fi” indicates the end of the inner if statement and all if statement should end with the keyword “fi”. The “if then elif then else fi” example mentioned in above can be converted to the nested if as shown belo...
/bin/bash NAME = TEST if id $NAME &> /dev/null ; then echo "user exists" fi 双分支的if语句: if 判断条件; then statement1 statement2 ... else statement4 statement5 ... fi 多分支的if语句: if 判断条件1; then statement1 ......
The condition$(whoami) = 'root'will be true only if you are logged in as the root user. Don't believe me? You don't have to. Run it and see it for yourself. Using if-else statement in bash You may have noticed that you don’t get any output when you run theroot.shscript as...
While ‘else if’ is a powerful tool for handling multiple conditions in bash scripting, it’s not the only one. An alternative approach is the ‘case’ statement. ‘Case’ statements can be more readable and easier to maintain than a long list of ‘elif’ conditions, especially when you’...