I can use /dev/zero or /dev/urandom to write values into a file. Is there also a way to write an unlimited amount (just restricted by a command line switch maybe) of defined numbers (e.g. 1, 2, etc.) into a file?
I know about echo "1" > file but I need moooore!
The file should contain the same string value repeated without newlines. Ideally I could write bit test patterns like 0xAA or 0x55, but I guess I can manage that myself once I know how to write one value.
For an unlimited amount of arbitrary data, don't forget about yes!
$ yes 42
42
42
42
42
42
42
42
42
42
42
42
42
^C
Hit Control-C when you've had enough!
Alternatively to Control-C, use timeout:
timeout 10 yes 42
While loop
http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_09_02.html
plus basic math
$ a=1
$ a=$(($a+1))
$ echo $a
2
Combining
seq mentioned by @123 in a comment and a few seq examplesbusyboxI found the following works best for my needs:
for i in $(busybox seq 10); do echo -n "1" >> filename; done
where 10 defines the number of items to write.
seq 1 100000000000– 123 Jul 14 '16 at 12:44