How do you use if condition in awk?
Syntax:
- if (condition){ statement-1. } else{ statement-2. }
- if (condition){ statement-1. } elseif{ statement-2. } elseif{ statement-3. } ……. else{ statement-n. }
- 11001 Sales 45 $3000. 11002 HR 32 $1500. 11003 Marketing 26 $1200. 11004 HR 25 $2500.
What does NR == FNR mean?
In awk, FNR refers to the record number (typically the line number) in the current file, NR refers to the total record number. The operator == is a comparison operator, which returns true when the two surrounding operands are equal.
What is awk ‘- F option?
The -f option only controls where the awk program is read from. If enabled, it means that the first filename is in fact the name of a file that contains the awk program. Otherwise, the first filename is the first file to start looking for patterns.
What does $1 $2 indicate in the awk file?
Awk works by scanning through each line of text (or record) in the file and carrying out any instructions you tell it on that line. In awk we access fields using syntax like: $1 or $2. $1 indicates that you are referring to the first field or first column.
What does FS mean in awk?
– Field Separator
awk Built-in Variables FS – Field Separator The variable FS is used to set the input field separator. In awk , space and tab act as default field separators. The corresponding field value can be accessed through $1 , $2 , $3 and so on.
What are some examples of if condition in AWK?
Here are some awk if condition examples. Data used in these examples: Print entries (full line) where first column is greater than certain threshold. Here $0 represents full line. Print entries (2nd field only) where first column is greater than certain threshold.
How do you use AWK if else statement?
Awk If Else Statement In the above simple awk If statement, there is no set of actions in case if the condition is false. In the awk If Else statement you can give the list of action to perform if the condition is false. If the condition returns true action1 will be performed, if the condition is false action 2 will be performed.
How do I find the value of a field in AWK?
1. awk -F”#” – Press “#” to separate the fields: $1=123, $2= 192.168.1.33, $3 = google … 2. if ($1==123) print $2 – Determine whether $1 is equal to “123”, that is, whether the content of the first column is “123”, and if it is, print the content of the second column.
What happens after all the actions are performed in AWK?
After all the actions are performed it continues to execute the next statements. In the above simple awk If statement, there is no set of actions in case if the condition is false. In the awk If Else statement you can give the list of action to perform if the condition is false.