My requirement is this. Am trying to find a one liner unix command, which will check the last line of the file for 0. If it is zero, it would pick the previous line, else it should display the last line.
Eg:
Output expected -- ijhk
Please share your ideas.
Thanks.
I am glad that you have code that does what you want. But, it does not do what you requested. You said that if the last line is 0, it should print the previous line. The previous line is the next to the last line of the file (which also contains 0; not ijhk which is the next to the next to the last line).
Code that seems to do what you requested, even though it is not what you apparently want, is:
or as a 1-liner:
If your system has a really old version of the tail (and it doesn't support a -n option, change the:
in either script to:
Note that either of these scripts will give you an empty line of output if your input file doesn't contain at least two lines. Your problem statement didn't say anything about what should happen if there are less than two lines in your input file.
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