seq

Wat het doet

Zo schrijf je het

seq [OPTION]... LAST
seq [OPTION]... FIRST LAST
seq [OPTION]... FIRST INCREMENT LAST

Meest gebruikt

Niets past bij dit filter.

$ als gewone gebruiker# als root (of met sudo)

1. 11 to 5

   $seq 5

   One number per line.

2. 2Loop over numbers

   $for i in $(seq 1 3); do echo "round $i"; done

   Also: for i in {1..3}.

3. 3With a variable end

   $N=4; for i in $(seq 1 $N); do echo $i; done

   {1..$N} does not work in bash.

4. 4Steps

   $seq 0 10 50
   0
   10
   20
   30
   40
   50

   Start, step, end.

5. 5Count down

   $seq 5 -1 1

   Negative step.

6. 6Equal width

   $seq -w 8 11
   08
   09
   10
   11

   For file names.

7. 7One line with commas

   $seq -s, 1 5
   1,2,3,4,5

   Lists for other commands.

8. 8Ping a range of hosts

   $for i in $(seq 10 20); do ping -c1 -W1 192.168.122.$i &>/dev/null && echo ".$i up"; done

   Quick scan of your own lab network.

9. 9Create test files

   $for i in $(seq -w 1 20); do touch file$i.txt; done

   file01.txt … file20.txt.

10. 10Decimal steps

    $seq -f "%.1f" 0 0.5 2

    0.0 0.5 1.0 1.5 2.0.

Niets past bij dit filter.

Exitcodes