For each of the 150 files, assign an awk variable with the filename without the .gtf
extension. Use ;
as a delimiter and where the first column matches "trascript", print 3 columns, the first being the sample id variable you assigned above, the second being the transcript_id
field and the third being the TPM
field. Append output across all files to a single combined output file.
You should be able to write your awk
command using the above logic.