shell-whiz-toolkit/awk/README.md

awk

data manipulation

• print elements in the column 3 that has the word "good" in the other columns

$ awk '/good/ { print $3 }' inventory

• syntax:

$ awk -f {PROGRAM FILE} FILENAME

• awk program is:

PATTERN{
  ACTION 1
  ACTION 2
  ACTION 3
}

with

. (Dot) Match any character
* Match zero or more character
^ Match beginning of line
$ Match end of line
\ Escape character following
[ ] List
{ } Match range of instance
+ Match one more preceding
? Match zero or one preceding
| Separate choices to match

---

if condition

if (condition)
{
  Statement 1
  Statement 2
  Statement N
  if condition  is TRUE
}
else
{
  Statement 1
  Statement 2
  Statement N
  if condition is FALSE
}