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Useless use of cat (UUOC) is common Unix jargon for command line constructs that only provide a function of convenience to the user. [12] In computing, the word "abuse", [ 13 ] in the second sense of the definition, is used to disparage the excessive or unnecessary use of a language construct; thus, abuse of cat is sometimes called "cat abuse".
Some commands are built into the command interpreter; others exist as external commands on disk. Over multiple generations, commands were added for additional functions. In Microsoft Windows, a command prompt window that uses many of the same commands, cmd.exe, can still be used.
There are two command-line switches to modify the behaviour when concatenating files: Text mode - This copies the text content of the file, stopping when it reaches the EOF character. copy /a doc1.txt + doc2.txt doc3.txt copy /a *.txt doc3.txt Binary mode - This concatenates files in their entirety, ignoring EOF characters.
The following commands are equivalent. They list files in the directory /bin. The program is ls, having three flags (l, t, r), and the argument is the directory /bin: ls -l -t -r /bin ls -ltr /bin The following command displays the contents of the files ch1.txt and ch2.txt. The program name is cat, having two file name arguments: cat ch1.txt ...
command: Shell programming Mandatory Execute a simple command compress: Filesystem Optional (XSI) Compress data 4.3BSD cp: Filesystem Mandatory Copy files PDP-7 UNIX crontab: Misc Mandatory Schedule periodic background work System V csplit: Text processing Mandatory Split files based on context PWB UNIX ctags: C programming Optional (SD) Create ...
The tee command is normally used to split the output of a program so that it can be both displayed and saved in a file. The command can be used to capture intermediate output before the data is altered by another command or program. The tee command reads standard input, then writes its content to standard output. It simultaneously copies the ...
unix2dos (sometimes named todos or u2d) is a tool to convert line breaks in a text file from Unix format (Line feed) to DOS format (carriage return + Line feed) and vice versa. . When invoked as unix2dos the program will convert a Unix text file to DOS format, when invoked as dos2unix it will convert a DOS text file to Unix for
The command-syntax on CP/M is: TYPE ufn Note: ufn = unambiguous file reference In MP/M, the command has a pause mode. It is specified by entering a 'P' followed by two decimal digits after the filename. The specified number of lines will be displayed and then the command will pause until a carriage return is entered. [7]