如何在wc -l输出周围创建if语句的同一行

Question

I'm not at all familiar with tcsh, so really hoping someone could drop some knowledge on what i'm missing here. I'm trying to build a single lined if else statement that checks the number of rows in a file, and outputs a touch file if the number of rows > 1. I'm checking if rows is greater than 1 because the file can be generated with just header info. (Separately if anyone has any useful online guides that I may use for all things tcsh, that would also be very helpful)

Example file 1 (has data):

title1,title2 data1,data2

Example file 2 (empty):

title1,title2

Expected output:

If file has data, generates a has_data.txt, else does not generate file

What I've tried:

wc -l dummy_file_empty.txt >1 && touch has_data.txt - does not really evaluate greater than

update `` is used for evaluating statements in line, and $output is an array? So needed to reference index 1 to get the line count

set output=`wc -l dummy_file_empty.txt` | if($output[1] >1) touch has_data.txt - returns expression syntax error

if ( wc -l dummy_file_empty.txt ) > 10 touch has_data.txt - returns expression syntax error

i can invoke bash shell as-well if a solution exists in bash ( saw examples where bash is piped at the end of statement |bash and tested it to ensure it works on my machine)

Answer 1

[[ $(cat file.txt | wc -l) -gt 1 ]] && touch has_data.txt

When you use > this will attempt to write to a file. In this case a file named 1 or 10 . You want to use -gt which stands for greater than.

If you're running this in a tcsh terminal, then you can invoke this via bash:

bash -c '[[ $(cat file.txt | wc -l) -gt 1 ]] && touch has_data.txt'

Answer 2

Just wanted to add a solution where I've gotten somewhat close..albeit i'm not really able to handle scenarios where the file might not exist. Hopefully somebody has guidance on whether this a good way to do it.

set output=`wc -l file.txt` && if ( $output[1] > 1 ) touch has_data.txt