CODEWITHSUNDEEP
awk
Jaron Bradley
Jaron Bradley

Reputation: 1119

Awk printing characters between fields

I've tried googling for the answer to my question, and i'm sure the answer is out there, I just don't know what to search. Basically what i'm trying to do is take a line from a file grab the last 2 fields (seperated by "\") and then print those two fields.

However, I want these fields to be printed out with 2 backslashes in beween them. (i'm working with windows path's) Here's my statement

$ line = C:\Windows\System32\folder1\folder2\folder3\executable.exe

$ echo $line | awk -F "\\" '{print $(NF-2)$(NF-0)}'

I want the output to return folder3\\executable.exe

My experience with awk is limited. Thank you in advanced for any help

Upvotes: 3

Views: 5293

Answers (3)

Gianni B.
Gianni B.

Reputation: 2731

You can also use rev for reverse the string, split your string on the '\' separator and then take the first two string in the array. In the end, compose the string with the previous separator '\' and reverse again.

The reverse is necessary because you can't always know the numbers of sub-directory between the root and the last one.

Upvotes: 0

Levon
Levon

Reputation: 143047

From the command line:

$ echo $line | awk 'BEGIN{FS="\\"; OFS="\\\\"} {print $(NF-1), $NF}'

will give you

folder3\\executable.exe

for your line

FS sets the field separator for the line(s) processed, OFS the output field separators. The double \\ are necessary to escape the special meaning of the single \.

Note that your assignment to line should enclose the string in "" with no spaces before/after the =. I.e.,

line="C:\Windows\System32\folder1\folder2\folder3\executable.exe"

Alternatively, this script (so.awk)

BEGIN { FS="\\"
        OFS="\\\\"}
{print $(NF-1), $NF}

will give you the same output if invoked as echo $line | awk -f so.awk data.txt where data.txt contains your one (or possibly more) path(s)

Update:

In case you should want to print leading double backslashes: print "", $(NF-1), $NF will do the trick by adding an empty string at the start, as mentioned in a helpful comment by @Dennis Williamson

Upvotes: 2

mpez0
mpez0

Reputation: 2883

The variable you want to set is OFS, for Output Field Separator.

Upvotes: 0

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