Everything in awk has the form condition{action} . If the condition evaluates to 1 then the action is performed. If the condition is omitted then the default condition is 1, so the action is always performed. If the action is omitted then the default action is performed, which is {print $0} . In this case the condition is 1 (true) and the action is omitted, therefore {print $0} is performed, which is "print the entire record".
what a silly mistake. Thank you!
PS,
any hint what is the purpose of that "1"?
As Scrutinizer described in his last post, it causes your output to be printed. Without it, you change data on some lines in an internal buffer, but never print the results.
Let me try to make it simple and explain you. awk works on a theme which is <:condition:><:action/operations:> so lets say if you have given one condition as follows:
So in above example you are checking condition if $1 is greater than 2 then if condition is TRUE then you are asking it to perform action {print $0}, which will print the $0(means complete line) whose $1 is grater than value 2. Now if we are giving like as follows.
So in above example whenever condition is going to be TRUE then as there is NO action given by us to perform so awk will perform the default action which is printing the line. Similarly by giving 1 in code we are making condition TRUE and not giving any further actions so when condition is TRUE and no action given so awk will do default action which is print. Hope this helps you, enjoy learning
EDIT: Like an example as follows.
So in above example you are giving condition like if $1 is grater than 2 then perform action which is next, means don't do any further action but if condition is FALSE then it will not perform any action and will go to 1 and as 1 will make condition TRUE with no action further given so it will print the line, so basically whichever line's $1 is grater than 2 we are skipping them here.
Thanks,
R. Singh
Last edited by RavinderSingh13; 10-04-2015 at 03:46 PM..
Reason: Added an example for same now.
Hello,
I have two text files, each with a single column,
file 1:
124152970
123899868
123476854
54258288
123117283
file 2:
124152970
123899868
54258288
123117283
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