Tag: Day

while loop

? Syntax while condition; do…; done
? Case 1
#!/bin/bash
while :
do
load=w|head -1|awk -F’load average: ”{print $2}’|cut -d. -f1
if [$load -gt 10 ]
then
top|mail -s “load is high:

? [-f file] Determine whether it is a normal file and exist
? [-d file] Determine whether it is a directory and exist
? [-e file] Determine whether a file or directory exists
>? [-r file] Determin

shell
See 100 linux shell questions.
Function to reduce duplication of code.
Shell is a collection of system commands

The first line starts with #!/bin/bash
#!/bin/bash
echo “123”
w
ls
Sp