Time it in Bash

You can use time to check how long anything takes:

time ${command}

For example, time host wikipedia.org returns the following:

wikipedia.org has address 208.80.154.224
wikipedia.org has IPv6 address 2620:0:861:ed1a::1
wikipedia.org mail is handled by 10 mx1001.wikimedia.org.
wikipedia.org mail is handled by 50 mx2001.wikimedia.org.
host wikipedia.org  0.00s user 0.02s system 27% cpu 0.092 total

Portable scripts should use time -p since this is consistent with various implementations:

time -p sha256sum /bin/ls should return:

12477deb0e25209768cbd79328f943a7ea8533ece70256cdea96fae0ae34d1cc  /bin/ls
real 0.00
user 0.00
sys 0.00