Unix filters

Unix relies heavily on filters to sort files and search for keywords in a file. A filter is a command that takes some input, transforms the data and sends it out as output. We will look at the following in this section:

awk : Pattern scanning and processing
grep : Search for a keyword
head : Display the beginning part of a file
sort : Sort information
tail : Display the last part of a file
tee : Record data to standard output

Exercises

Find all occurences of the word "important" in any of the files in your home directory.