Getting Started

• basic

  Sample data:
   Beth   4.00 0
   Dan    3.75 0
   Kathy  4.00 10
   Mark   5.00 20
   Mary   5.50 22
   Susie  4.25 18
   
   ¿¹Á¦:
   awk '$3 > 0 { print $1, $2, $3 }' awk.data 
   °á°ú:
   Kathy 4.00 10
   Mark 5.00 20
   Mary 5.50 22
   Susie 4.25 18
   
   ¿¹Á¦:
   awk '$3 > 0 { print $1, $2 * $3 }' awk.data
   °á°ú:
   Kathy 40
   Mark 100
   Mary 121
   Susie 76.5
   

  Áß¿ä:
   $0 : line Àüü
   

• The structure of an AWK Program

  pattern { action } . . . single quotes protects $ by shell and allows multi lines

  awk '$3 == 0 { print $1 }' awk.data
   awk '$3 == 0'              awk.data
   awk         '{ print $1 }' awk.data
   

  Áß¿ä:
   { action } »ý·«  ->  default : { print $0 }
   pattern »ý·«  ->  default : TRUE
   

• Running an AWK program

  awk 'program' file1 [file2 ...] awk 'program' # from stdin until end-of-file awk -f progfile input-files