You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.8 KiB
57 lines
1.8 KiB
2 years ago
|
#!/bin/sh
|
||
|
|
# This spell will teach you the basics of Bash scripting best practices and optimization techniques
|
||
|
|
|
||
|
|
echo "The magic of scripting can be improved with the following best practices and optimization techniques:"
|
||
|
|
|
||
|
|
# 1. Use shebang
|
||
|
|
# Always use the shebang line (#!/bin/sh or #!/bin/bash) at the top of your script to specify the interpreter.
|
||
|
|
|
||
|
|
# 2. Use single quotes for strings
|
||
|
|
# Use single quotes for strings to prevent variable and command substitution.
|
||
|
|
|
||
|
|
string='Hello, World!'
|
||
|
|
echo $string # This will print 'Hello, World!'
|
||
|
|
|
||
|
|
# 3. Avoid using unnecessary subshells
|
||
|
|
# Avoid using subshells by using command substitution with $() instead of backticks `` or $(command).
|
||
|
|
|
||
|
|
result=$(command) # Better
|
||
|
|
result=`command` # Not recommended
|
||
|
|
|
||
|
|
# 4. Use double quotes for variables
|
||
|
|
# Use double quotes for variables to prevent word splitting and globbing.
|
||
|
|
|
||
|
|
name="John Doe"
|
||
|
|
echo "My name is $name" # This will print 'My name is John Doe'
|
||
|
|
|
||
|
|
# 5. Declare variables as local
|
||
|
|
# Declare variables as local when they are only used within a function.
|
||
|
|
|
||
|
|
my_function() {
|
||
|
|
local my_variable="Hello, World!"
|
||
|
|
echo $my_variable
|
||
|
|
}
|
||
|
|
|
||
|
|
my_function
|
||
|
|
|
||
|
|
# 6. Use the -e option for echo
|
||
|
|
# Use the -e option for echo to enable the interpretation of backslash escapes.
|
||
|
|
|
||
|
|
echo -e "This is a new line \nThis is a tab \t"
|
||
|
|
|
||
|
|
# 7. Use the -n option for echo
|
||
|
|
# Use the -n option for echo to suppress the trailing newline.
|
||
|
|
|
||
|
|
echo -n "Hello, "; echo "World!" # This will print 'Hello, World!' on the same line
|
||
|
|
|
||
|
|
# 8. Use the -x option for debugging
|
||
|
|
# Use the -x option to debug your script by displaying commands and their arguments as they are executed.
|
||
|
|
|
||
|
|
# 9. Use the -u option for undefined variables
|
||
|
|
# Use the -u option to catch references to uninitialized variables.
|
||
|
|
|
||
|
|
# 10. Use the -o option for options
|
||
|
|
# Use the -o option to enable or disable options within a script.
|
||
|
|
|
||
|
|
echo "Spell cast successfully"
|