Shell character intercept command awk

2. awk command
   # awk ' Condition 1{action 1} Condition 2{action 2} .... ' Filename
   General use of relational expressions as criteria
   Action: 1, formatted output 2, Flow control statement

4. column that handles the cut command cannot intercept spaces

   Example: Intercepting disk usage
   

   DF- H | grep "sda1" | awk ' Begin{print ' This was sda1 hard use persent: '} {print $} ' | Cut- F 1-d "%"

6. Begin keyword

   A, before all actions are processed, you can add a script comment in the first line of the output text (as in the previous example)

   b, custom intercept characters, use FS, must add begin, delete first row

8. FN Built-in variables

   Custom Intercept characters
   

   awk ' {fs= ': "}{print" \ T "$ /etc/passwd } '

   Need to be modified to
   

   awk ' begin{fs= ': "}{print" \ T "$ /etc/passwd "

10. End keyword
    

    Command finishes, add end comment at end of output text
    

    awk ' End{print ' This is END test!! '} {fs= ":"} {print $ \ t ' $ /etc/passwd } '

12. Relational operators

    Displays disks with a disk share of more than 5%
    

    DF- H | awk ' $5>5{print ' \ t ' $ ' | Cut- F 1-d "%"

Shell character intercept command awk