Which one of the following lines of unix commands can tell you the number of lines in a file?
Which one of the following lines of unix commands can tell you the number of lines in a file?
Select an option to attempt
Correct Answer: Option D
Explanation
Unix/Linux commands — identifying 'wc -l':Common Unix commands:• wc -l filename: counts the number of LINES in a file. ('wc' = word count; '-l' = lines only)• ls -a: lists ALL files including hidden files (those starting with '.')• df -h: displays disk usage in human-readable format (df = disk free)• pc -f: NOT a standard Unix command (does not exist).Usage of wc:• wc filename: outputs lines, words, and characters• wc -l filename: lines only• wc -w filename: words only• wc -c filename: byte countBioinformatics application: wc -l is routinely used to count sequences in FASTQ files (divide by 4), SAM/VCF records, etc.Answer: 'wc -l filename' counts the number of lines in a file.