Linux Sysadmin Basics 4.1 -- Filtering Output and Finding Things (&&, cut, sort, uniq, wc, grep)

• cut OPTION… [FILE]…

  remove sections from each line of files

  -d, --delimiter=DELIM
                use DELIM instead of TAB for field delimiter

  -f, --fields=LIST
                select only these fields; also print any line that contains no delimiter character, unless the -s option is specified

• sort [OPTION]... [FILE]...

  or sort [OPTION]... --files0-from=F

  sort lines of text files

  -b, --ignore-leading-blanks
                ignore leading blanks

  -f, --ignore-case
                fold lower case to upper case characters

• uniq [OPTION]... [INPUT [OUTPUT]]

  report or omit repeated lines

• wc [OPTION]... [FILE]...

  or wc [OPTION]... --files0-from=F

  print newline, word, and byte counts for each file

• grep [OPTIONS] PATTERN [FILE...]

  or grep [OPTIONS] -e PATTERN ... [FILE...]

  or grep [OPTIONS] -f FILE ... [FILE...]

  print lines matching a pattern

---

# file.txt

dave:we

user:love

someone:linux

someone:linux

prog1 && prog2
cat file.txt | cut -d: -f2
cat file.txt | sort -bf
cat file.txt | uniq
wc file.txt
cat file.txt | grep user