awk and sed.
Another of my subjects this semester at uni, had me using a bit of awk and sed this week just gone, and I must say, that I now do have a more understanding knowledge of both of these tools.
Before I did understand how to do rather small things with each (like change instances of words, to another word, and pull out every 4th word from a sentence to use elsewhere), I never did try and go any more into either of them.
As you can see from the following code snippets, I think I have dug a bit more into these tools.
sed: Change the order, of the first two parameters called by a function
s/somefunc((.*),(.*)(,.*))/somefunc(2,13)/g
awk: add line numbers to each line of a source file, without skipping numbers. Comments should not be numbered.
{ if ($1 ~////) { printf("%5st%sn", "", $0); next } } { if ($1 ~//*/) { z = 1; printf("%5st%sn", "", $0); next } } { if ($1 ~/*//) { z = 0; printf("%5st%sn", "", $0); next } } { if (z > 0) { printf("%5st%sn", "", $0); next } } { printf("%5st%sn", (NF? ++a ":" :""), $0) }
A sample output for this awk script would be:
1: #include <stdio.h>
// main routineSystem Message: WARNING/2 (<string>, line 24)
Block quote ends without a blank line; unexpected unindent.2: int main(int argc, char *argv[]) 3: {
System Message: WARNING/2 (<string>, line 24); backlink
Inline emphasis start-string without end-string.System Message: ERROR/3 (<string>, line 26)
Unexpected indentation.System Message: WARNING/2 (<string>, line 29)
Block quote ends without a blank line; unexpected unindent.4: printf("%s", "Hello, world"); 5: return 0; // return zero! 6: }
And comparing what I did, to some other features of these tools, this is still only the beginning of their abilities.