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README.md - minor fixes and updates

- signed-off-by: trimstray <trimstray@gmail.com>
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trimstray 4 years ago
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@@ -331,7 +331,7 @@ true && { echo success;} || { echo failed; }
some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr)
```

###### Pipe stdout and stderr to separate commands
###### Redirect stdout and stderr each to separate files and print both to the screen

```bash
(some_command 2>&1 1>&3 | tee errorlog ) 3>&1 1>&2 | tee stdoutlog
@@ -343,6 +343,12 @@ some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr)
history | awk '{ a[$2]++ } END { for(i in a) { print a[i] " " i } }' | sort -rn | head
```

###### Empty a file (truncate to 0 size)

```bash
>filename
```

###### Quickly backup a file

```bash


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