basic

basic:
(#SA:server address,LA：Local address,SP:server path)
1.Connect to remote server:$ ssh name@SA  
  Copy file to remote server:$ scp LA name@SA:SP(/home/×××)
  Copy file to local:$ scp name@SA:SP LA 
2.
a)File size：$ du -sk filename
  Folder size:$ du -sh dirname 
  Memory size:$ free
  Disk size:$ df -h
  Cpu information:$ cat /proc/cpuinfo
b)Current process:$ ps -ef
  Residual memory:$ free -mf
  Using memory:$ cat /proc/meminfo
  Kill process:$ kill -s9 number(first,use "$ ps -ef" to check out,then,kill process )
c)
1)$ chmod +x processname
  $ ./processname
2)$ bash processname
d)
If-else:
eg1:
#!/bin/bash
a=10
b=20
if [ $a == $b ]
then
	echo "a is equal to b"
elif [ $a -gt $b ]
then 
	echo "a is greater than b"
elif [ $a -lt $b ]
then
	echo "a is less than b"
else
	echo "None of the condition met"
fi
eg2:
#!/bin/bash
if test $[2*3] -q $[1+5];then echo 'The two numbers are equal!';fi;

For:
eg:
for loop in 1 2 3 4 5
do 
   echo "The value is :$loop"
done