Some characters can not be written directly on the command line. Would remove the two files 'cumbersome' and 'filename.txt'. Will remove the file 'cumbersome filename.txt', while rm cumbersome filename.txt Single quotes have no special meaning within double quotes and vice versa. The only backslash escapes accepted within double quotes are \", which escapes a double quote, \$, which escapes a dollar character, \ followed by a newline, which deletes the backslash and the newline, and lastly \\, which escapes the backslash symbol. The only backslash escape accepted within single quotes is \', which escapes a single quote and \\, which escapes the backslash symbol. Other than that, no other kind of expansion (including brace expansion and parameter expansion) will take place, the parameter may contain spaces, and escape sequences are ignored. There is one important difference between single quoted and double quoted strings: When using double quoted string, variable expansion still takes place. When that happens, the user can write a parameter within quotes, either ' (single quote) or " (double quote).
Sometimes features such as parameter expansion and character escapes get in the way. Some switches are common to most command though, for example ' -help' will usually display a help text, ' -i' will often turn on interactive prompting before taking action, while ' -f' will turn it off.
#Fish shell aliases manual#
Switches differ between commands and are documented in the manual page for each command. For example, the ' ls' command usually lists all the files and directories in the current working directory, but by using the ' -l' switch, the behavior of ' ls' is changed to not only display the filename, but also the size, permissions, owner and modification time of each file. Switches almost always start with one or more hyphens ' -' and alter the way a command operates. More than one command can be written on the same line by separating them with semicolons.Ī switch is a very common special type of argument. by pressing the return key) or a semicolon ' '. Every command ends with either a newline (i.e. open, open files with the default application associated with each filetypeĬommands and parameters are separated by the space character ' '.man, display a manual page on the screen.Otherwise the whole filename, including the directory (like /home/me/code/checkers/checkers or. If the program file is located in one of the directories in the PATH, it is sufficient to type the name of the program to use it. There are also manual pages for many other things, such as system libraries and important files.Įvery program on your computer can be used as a command in fish. There are manual pages for almost every command on most computers. The man command takes the name of the manual page to display as an argument. Man is a command for displaying a manual page on a given topic. If you want to find out more about the echo command used above, read the manual page for the echo command by writing: man echo And every single command follows the same simple syntax. There are commands for performing a set of commands multiple times, commands for assigning variables, commands for treating a group of commands as a single command, etc. Everything in fish is done with commands. In the example above, the output will be 'hello world'. echo is a command which will write its arguments to the screen.
Every fish command follows the same simple syntax.Ī command is executed by writing the name of the command followed by any arguments. Shells like fish are used by giving them commands. For the latest information on fish, please visit the fish homepage. A shell is a program used to execute other programs. fish is a user friendly commandline shell intended mostly for interactive use. This is the documentation for fish, the friendly interactive shell.
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