[Bug 1854113] Re: pbcopy & pbpaste for Linux

[psl]

I just copy possible implementation of pbcopy and pbpaste for Linux from
#1854092. That issue has more examples of similar commands for
PowerShell, etc

```
#!/bin/sh
# print data from clipboard to stdout, again and again...

MODE="xclip"
#MODE="xsel" # doesn't work well, clipboard is not cleaned and the same text is printed again and again :-(

pbcopy ()
{
   if [ "$MODE" = "xclip" ]; then
     xclip -selection clip -i
   else
     xsel --clipboard --input
   fi
}

pbpaste ()
{
   if [ "$MODE" = "xclip" ]; then
     xclip -selection clip -o
   else
     xsel --clipboard --output
   fi
}

# MAIN
pbcopy </dev/null # clear clipboard
while :; do
   TXT="$(pbpaste)"
   if [ -n "$TXT" ]; then
      echo "$TXT"
      pbcopy </dev/null # clear clipboard
   else
      sleep 0.1 # sleep 100ms
   fi
done
```

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https://bugs.launchpad.net/bugs/1854113

Title:
  pbcopy & pbpaste for Linux

Status in xclip package in Ubuntu:
  New

Bug description:
  This is not a bug report but request for enhancement. Ubuntu 18.04
  doesn't have pbcopy & pbpaste commands.

  Mac users can use two commands, pbcopy and pbpaste, to work with
  clipbopard in their scripts. No such "easy to use" solution is
  available at Linux! Could be pbcopy and pbpaste commands implemented
  at Linux? That will make migration of Mac user to Linux World
  easier... ;-)

  There are several articles how to implement pbcopy and pbpaste at
  Linux, most of them use "alias", something like this:

  ```
  # mimic osx pbcopy/pbpaste
  alias pbcopy="xclip -selection clipboard -i"
  alias pbpaste="xclip -selection clipboard -o"
  ```
  or
  ```
  alias pbcopy='xsel --clipboard --input'
  alias pbpaste='xsel --clipboard --output'
  ```

  I think that alias commands cannot be used in shell script, right? Is
  it possible to implement pbcopy and pbpaste in the way to be usable in
  scripts too? These commands could be included in "xclip" package.

  BTW, pbcopy and pbpaste are binary executable files at OS X.

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