The Bash Wiki¶

Executing Bash in Fish¶

If fish is your default shell and you want to copy commands from the internet that are written in a different shell language, bash for example, you can proceed in the following way:

Consider, that bash is also a command. With man bash you can see that there are two ways to do this:

bash has a switch c to read from a string:

> bash -c SomeBashCommand

or bash without a switch, opens a bash shell that you can use and exit afterwards.

Wildcards¶

https://ryanstutorials.net/linuxtutorial/wildcards.php
Allows you to create a pattern defining a set of files or directories.
May be used with any command
- represents zero or more characters
? - represents a single character
[]- represents a range of characters

Filters¶

Changes how command line accepts text data
head Prints first lines of text. Default is 10 lines. ex to show only 4 lines:

head -4 mysampledata.txt
    Fred apples 20
    Susy oranges 5
    Mark watermellons 12
    Robert pears 4

tail Shows last lines of text. Default is 10. ex to show only 3 lines:

tail -3 mysampledata.txt
    Greg pineapples 3
    Oliver rockmellons 2
    Betty limes 14

Linux Notes¶

Extensions don't matter in Linux, cause the OS looks at the contents not the extension.
Linux is case sensitive
Spaces in file names are accepted, but complicate things. Avoid it.
- Can be avoided by 'quoting' the spaced name.
- . in front of a filename makes the file hidden. Can still be found with ls -a