Goals
Generate random string in Shell and using /dev/urandom as the source. This random string typically useful to be used as encryption key.
Implementation
We will use combination of tr and head to generate 32 random characters. Command below will only output alphanumeric and some characters symbol only.
$ </dev/urandom tr -dc 'A-Za-z0-9!"#$%&()*+,-./:;<=>?@[\]^_`{|}~' | head -c 32 && echo
}s9s2c8W7aZlI:yg<{bg&-<7YnyJEk.u
On Mac OS X system you may need to define LC_ALL=C environment variable as shown below.
$ LC_ALL=C </dev/urandom tr -dc 'A-Za-z0-9!"#$%&()*+,-./:;<=>?@[\]^_`{|}~' | head -c 32 && echo
f(s_TPj*.H3Z/s[*:zLe[=9&0$FF"*8[
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