27 lines
975 B
Awk
Executable File
27 lines
975 B
Awk
Executable File
#!/usr/bin/awk -f
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# https://www.grymoire.com/Unix/Awk.html
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# when awk reads a file line by line, it also provides you with
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# variables representing the "fields" in each line.
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# so, awk processes input line by line, but it makes it simple for you
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# to process each line field by field, or to pick out any subset of
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# fields that you want to crunch.
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# by default, fields are words separated by whitespace, and they are
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# represented by the variables $1, $2, $3 and so on.
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# since we're practicing with /etc/password as the input file, whitepace
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# separators won't work for us. fields in /etc/passwd are separated
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# by colons. awk allows us to specify an alternate field separator
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# by setting the FS variable.
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# in this example, we'll change FS to a colon in the BEGIN block, and
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# we will then print fields 1, 6 and 7 from each line of the input file.
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# these are the username, their home directory path, and their shell.
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BEGIN { FS=":" }
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{ print $1, $6, $7 }
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