The 'sed' command is the Stream Editor. It is a batch, non-interactive editor to use when you know ahead of time what kinds of edits you want to do on a file. Most editors are designed to be used interactively, in real time, when editing files. This program is not. It is used very commonly with unattended scripts running by themselves with no user monitoring them.
If you try the command 'man sed' you see it is listed as one of the examples of what sed can do.
A Unix filter is a command pattern that allows the output of one command to be "piped" into the input of the next command. Commands like 'ls' which list a directory are not filters since they only generate output. Filter examples are grep, sed, sort, uniq, awk. Commands in Unix are usually filters unless they only create output, like 'ls', 'vi', etc.
sed -n '5p' sum_bank_file.csv where sum_bank_file.csv--is file name '5p'-prints 5th line data
There is no traditional 'execute' command in Unix.
There is no standard 'format' command in Unix.
The 'CD' command is not standard for Unix. The 'cd' command, however, will change directories (folders). It is a means of navigating the Unix file system.
In Unix, use the 'man' command.
The "who" command.
cat /proc/version The above answer will only work on certain systems. For most Unix systems, use the 'uname' command to get the Unix version. AIX uses the oslevel command.
dig
nslookup
Believe it or not, nslookup.