Head and tail commands for linux commands, and tail commands

Head and tail commands for linux commands, and tail commands

• • Head
    • Syntax
    • Example
  • Tail
    • Syntax
    • Example
  • Example of combined head and tail usage

Head syntax

 head [-n -k ]... [FILE]...

Example

• The first 10 rows are displayed by default.

head /etc/passwd

• Displays the first k rows.

Head-k/etc/passwdhead-n k/etc/passwd (note the difference between head-n + k/etc/passwd)

• All contents except the last k rows are displayed.

head -n -k /etc/passwd

Tail syntax

tail [-n -k ]... [FILE]...

Example

• By default, the last 10 rows are displayed.

tail /etc/passwd

• Displays the last k rows.

Tail-k/etc/passwdtail-n k/etc/passwd (note the difference with the following) tail-n-k/etc/passwd

• The output starts from the first k rows.

tail -n +k /etc/passwd

Example of combined head and tail usage

// The first 20 rows are displayed, excluding the last 3 rows of head-n-3/etc/passwd | tail-n + 11, however, starting from row 3, head-n 20/etc/passwd | tail-n + 11 // displays all rows except the last three rows, however, only the last 10 rows of head-n-3/etc/passwd are displayed. | tail-n 10 // the last 10 rows of head-n 20/etc/passwd are displayed. | tail -n 10 // The value is displayed starting from row 11th, however, only the first 10 rows of tail-n + 11/etc/passwd | head-n 10 // are displayed starting from row 11th, excluding the last three rows of tail-n + 11/etc/passwd | head-n-3 // display the first 10 rows of tail-n 13/etc/passwd in the last 13 rows | head-n 10 // display the first 10 rows except the last three rows in the last 13 rows: tail-n 13/etc/passwd | head-n-3

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