Randomly succeeding command

ran() { [ $((RANDOM%100)) -lt ${1:-50} ]; }

Command will succeed n% of the time. ran 75 will cause command to succeed 75% of the time. No argument will cause it to succeed 50% of the time.

Sample Output

# verify randomness
$ t=0; for i in {1..1000000}; do ran 100 && t=$((t+1));done; echo $t
1000000
$ t=0; for i in {1..1000000}; do ran 20 && t=$((t+1));done; echo $t
200174
$ t=0; for i in {1..1000000}; do ran 0 && t=$((t+1));done; echo $t
0


# usage:
$ ran 20 && echo 20% hit

By: sesom42

2015-07-16 00:06:25

2 Alternatives + Submit Alt

Randomly run command

Randomly decide whether to run a command, or fail. It's useful for testing purposes. . Usage: ran PERCENTAGE COMMAND [ARGS] Note: In this version the percentage is required. . This is like @sesom42 and @snipertyler's commands but in a USABLE form. . e.g. In your complicated shell script, put "ran 99" before a crucial component. Now, it will fail 1% of the time allowing you to test the failure code-path. ran 99 my_complex_program arg1 arg2 Show Sample Output
This is sample output - yours may be different.
```
$ ran 50 echo hello; echo $?
hello
0
$ ran 50 echo hello; echo $?
1
```
5

ran() { [ $((RANDOM%100)) -lt "$1" ] && shift && "$@"; }

flatcap · 2015-07-16 13:32:45 30
Randomly succeeding command

Command will succeed n% of the time. ran 75 will cause command to succeed 75% of the time. No argument will cause it to succeed 50% of the time. Show Sample Output
This is sample output - yours may be different.
```
$ for i in {1..1000}; do ran 75 >> /tmp/ran_test; done
$ grep -c TRUE /tmp/ran_test
776
$ for i in {1..10}; do ran 75 >> /tmp/ran_test; done
$ grep -c TRUE /tmp/ran_test
7
$ for i in {1..1000000}; do ran 16 >> /tmp/ran_test; done
$ echo $(grep -c TRUE /tmp/ran_test)/1000000 | bc -l
.15952300000000000000

ran 80
TRUE
```
0

ran() { R=$((RANDOM%100)); if [ $R -gt "${1:-50}" ]; then echo FALSE; false; else echo TRUE; true; fi; }

snipertyler · 2015-07-15 15:34:56 9

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What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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