Hdi2u S22

• Try the command:

grep "^DE" hsy14768.embl and grep -x "DE.*" hsy14768.embl

• What are the ^ symbol and the -x parameter in these commands doing?
• You will need to check the manpage for grep to be sure.

• Move to your home directory and type ls –lR
• Use the above command with a pipe and a grep command to search for files created or modified today.
• List the files in the hdi2u_files directory and use the grep command to look for those containing the

cat *seqs.fasta | grep "^>" | wc -l

• Each sequence in a fasta file starts with a header line that begins with a >.
• request for redirection of output to a file, rather than as a character to look for.
• As before, the ^ symbol means "match only at the beginning of the line".