Linux – Which is more efficient – tar or zip compression? What is the difference between tar and zip

Both tar and cpio have a single purpose: concatenate many separate files to a single stream. They don't compress data. (These days tar is more popular due to its relative simplicity – it can take input files as arguments instead of having to be coupled with find as cpio has.)

In your case, you do not need either of these tools; they would have no useful effect, because you don't have many separate files. zfs send already did the same thing that tar would have done. So you don't have any files, only a nameless stream.

To compress the snapshot, all you have to do is pipe the zfs output through a compression program:

zfs send media/mypictures@20070607 | gzip -c > ~/backups/20070607.gz

gzip -dc ~/backups/20070607.gz | zfs receive media/mypictures@20070607

(You can substitute gzip with xz or bzip2 or any other stream-compression tool, if you want.)

Same question is asked on U&L SE that What is the difference between curl and wget?. And differences are:

• Wget's major strong side compared to curl is its ability to download recursively.
• Wget is command line only. There's no lib or anything but curl Features and is powered by libcurl.
• curl supports FTP, FTPS, HTTP, HTTPS, SCP, SFTP, TFTP, TELNET, DICT, LDAP, LDAPS, FILE, POP3, IMAP, SMTP, RTMP and RTSP. Wget supports HTTP, HTTPS and FTP.
• curl builds and runs on lots of more platforms than wget.
• Wget is part of the GNU project and all copyrights are assigned to FSF. The curl project is entirely stand-alone and independent with no organization parenting at all
• curl offers upload and sending capabilities. Wget only offers plain HTTP POST support.

Telnet

The telnet command is used to communicate with another host using the TELNET protocol. If telnet is invoked without the host argument, it enters command mode, indicated by its prompt (telnet> ) In this mode, it accepts and executes the commands listed below. If it is invoked with arguments, it performs an open command with those arguments.