Shell: operator

| Operator

Pipe symbol , The symbol is a vertical line : | .
usage :

command1 | command2

His function is to put the first command command 1 The result of execution is as command2 The input is passed to command 2

for example :

echo "aa bb cc" | awk -F '{print $1}' 
echo "aa bb cc" | awk -F '{print $2}' 
echo "aa bb cc" | awk -F '{print $3}' 

Output is ：

aa
bb
cc