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An alias will last for the life of the shell session. Regularly used aliases can be set from the shell's rc file (such as .bashrc) so that they will be available upon the start of the corresponding shell session. The alias commands may either be written in the config file directly or sourced from a separate file.
Set up color for ls: install: Copies files and set attributes ln: Creates a link to a file ls: Lists the files in a directory mkdir: Creates a directory mkfifo: Makes named pipes (FIFOs) mknod: Makes block or character special files: mktemp: Creates a temporary file or directory mv: Moves files or rename files realpath
Displays how a name would be interpreted if used as a command ulimit: Misc Optional (XSI) Set or report file size limit umask: Misc Mandatory Get or set the file mode creation mask System III unalias: Misc Mandatory Remove alias definitions uname: Misc Mandatory Return system name PWB UNIX uncompress: Misc Optional (XSI) Expand compressed data ...
The shell's primary means of debugging. Both xtrace and verbose can be turned off at the same time with the command set -. Verbose: [ set -v | set -o verbose] Prints a command to the terminal as Bash reads it. Bash reads constructs all at once, such as compound commands which include if-fi and case-esac blocks.
For example, the set, setenv and alias commands all did basically the same thing, namely, associate a name with a string or set of words. But all three had slight but unnecessary differences. An equal sign was required for a set but not for setenv or alias; parentheses were required around a word list for a set but not for setenv or alias, etc.
It is essentially the C shell with programmable command-line completion, command-line editing, and a few other features. Unlike the other common shells, functions cannot be defined in a tcsh script and the user must use aliases instead (as in csh).
A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive command language and a scripting language, and is used by the operating system to control the execution of the system using shell scripts. [2]
The rm (delete file) command removes the link itself, not the target file. Likewise, the mv command moves or renames the link, not the target. The cp command has options that allow either the symbolic link or the target to be copied. Commands which read or write file contents will access the contents of the target file.