Everybody Linux administrator knows how to use grep command to filter the output of interest. Unfortunately when grep is used the header line is lost, which sometimes is very useful. Below is the implementation of hgrep command that outputs the header as well

# cat hgrep
#!/bin/bash
IFS= read -r header
echo "$header"
grep "$@"

After creating the file allow execution and copy it to /usr/bin/

chmod a+x hgrep
cp hgrep /usr/bin/

Use example:

# ps aux |hgrep ssh
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root       548  0.0  0.2  72304  5456 ?        Ss   Apr21   0:00 /usr/sbin/sshd -D
root      1430  0.0  0.3 107992  7052 ?        Ss   Apr21   0:00 sshd: root@pts/1
root      1730  0.0  0.3 107992  7024 ?        Ss   00:05   0:00 sshd: root@pts/3
root      2132  0.0  0.1  11592  3068 pts/3    S+   03:14   0:00 /bin/bash /usr/bin/hgrep ssh

You can do a similar implementation for a sort command:

# cat hsort
#!/bin/bash
IFS= read -r header
echo "$header"
sort "$@"