Essential Books
suggest change
The Process ID (pid) of the current process:
~> $ echo $$
13246
Found a mistake? Have a question or improvement idea?
Let me know
.
Feedback about page:
Feedback:
Optional: your email if you want me to get back to you:
Send Feedback
Cancel
Internal variables:
*
Internal variables
*
Bash internal variables at a glance
*
*
*
HOME
*
etc...
*
*
FUNCNAME
*
*
*
PWD
*
HISTSIZE
*
IFS
*
*
OLDPWD
*
PATH
*
OSTYPE
*
MACHTYPE
*
PPID
*
HOSTTYPE
*
SECONDS
*
SHELLOPTS
*
HOSTNAME
*
EDITOR
*
BASH VERSION
*
BASH VERSINFO
*
BASH ENV
*
BASHPID
*
*
RANDOM
*
SHLVL
*
LINENO
*
GROUPS
*
UID
Table Of Contents
0
Getting started
1
Using trap to react to signals and system events
2
Listing files
3
Aliasing
4
Jobs and processes
5
Redirection
6
Control structures
7
Using cat
8
Arrays
9
Functions
10
Bash Parameter Expansion
11
Sourcing
12
Find
13
Here documents and here strings
14
Quoting
15
Conditional Expressions
16
Scripting with parameters
17
History substitutions
18
Math
19
Scoping
20
Process substitution
21
Programmable completion
22
Customizing PS1
23
Brace Expansion
24
Bash Arithmetic
25
getopts smart positional-parameter parsing
26
Debugging
27
Pitfalls
28
Script shebang
29
Pattern matching and regular expressions
30
Keyboard shortcuts
31
Change shell
32
Copying with cp
33
Internal variables
34
Job control
35
Case statement
36
Word splitting
37
Read a file
38
File transfer with scp
39
Pipelines
40
Managing PATH environment variable
41
Avoiding date using printf
42
Chain of commands and operations
43
Type of shells
44
true, false and commands
45
Color script output cross-platform
46
Navigating directories
47
Using sort
48
Namespace
49
co-processes
50
Typing variables
51
Jobs at specific types
52
Associative arrays
53
Handling the system prompt
54
Creating directories
55
File execution sequence
56
The cut command
57
Bash on Windows 10
58
Cut command
59
Splitting files
60
Global and local variables
61
Design Patterns
62
CGI Scripts
63
Select keyword
64
When to use eval
65
Networking with bash
66
Parallel
67
Grep
68
Strace
69
Sleep
70
Decodi
71
Contributors