This holds the Process ID (PID) of the script that appears in the following:
#!/bin/bash
echo $$
Let's execute it:
zarrelli:~$ ./pid.sh
4772
- Preface
- Let's Start Programming
- Operators
- Testing
- Quoting and Escaping
- Special characters
- The hash character (#)
- The semicolon character (;)
- The double semicolon character (;;)
- The case terminator (;;&) and (;&))
- The dot character (.)
- The double quotes ("...")
- The single quotes ('...')
- The comma character (,)
- The ,, and , () case modificators
- The ^^ and ^ () case modificators
- The backslash ()
- The forward slash (/)
- '...'
- The colon character (:)
- The exclamation (!)
- Keywords
- The asterisk (*)
- The double asterisk (**)
- Test operators (?)
- The substitution ($)
- The parameter substitution (${})
- The quoted string expansion ($'...')
- The positional parameters ($* and $")
- The exit status ($?)
- The process ID ($$)
- Grouping the command (command1 ; command2 ; commandn)
- Braces ({})
- The full path ({} ;)
- Expression ([])
- Expression ([[]])
- The array index ([])
- Characters range ([])
- Integer expansion ($[…])
- Integer expansion (((..)))
- DEMO
- Delimiters (< and >)
- The pipe character (|)
- The force redirection (>|)
- The logical OR (||)
- DEMO
- Logical AND
- The dash character (-)
- The double dash (--)
- Operator =
- Operator +
- The modulo operator (%)
- Operator ~
- Operator ~+
- Operator ~-
- Operator ~=
- Operator ^
- The control characters (^ and ^^)
- Quoting and escaping
- Summary
- Special characters
- Menus, Arrays, and Functions
- Iterations
- Plug into the Real World
- We Want to Chat
- Subshells, Signals, and Job Controls
- Lets Make a Process Chat
- Living as a Daemon
- Remote Connections over SSH
- Its Time for a Timer
- Time for Safety
The process ID ($$)
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