Shell script Programming Related 1

Definition and use of 1.shell variables

my_dir= "/home/yk/desktop"　　 # ( any character in single quotation marks is output as is, the variable in the single-quote string is not valid;)

Echo $my _dir

echo ${#my_dir} #获取字符串长度

2.shell annotations

　Single line #

Multiple lines : <<eof EOF

3.shell Pass-through parameters

　　$n. n represents a number, 1 is the first argument to execute the script, 2 is the second argument to execute the script, and so on ...

$ A file name to execute

./test.sh param1 param2 param3 #带参数执行脚本

$* and [email protected] is a list of all parameters, except that $* is to take all parameters as a parameter, [email protected ] Then there is one that counts as a

Shell script Programming Related 1