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helpful unix kernel commands
# convert lines in text file
tr '[:lower:]' '[:upper:]' <oldfile> newfile
# download a gzip file from remote server
ssh server "gzip -c remote_file" > local_file.gz
# secure copy local file to remote server
scp localfile
# find all files that have been modified in the last 3 days
find . -type f -mtime -3 | grep -v "/Maildir/" | grep -v "/logs/"
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