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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".
This is a list of commands from the GNU Core Utilities for Unix environments. These commands can be found on Unix operating systems and most Unix-like operating systems. GNU Core Utilities include basic file, shell and text manipulation utilities. Coreutils includes all of the basic command-line tools that are expected in a POSIX system.
This is a list of POSIX (Portable Operating System Interface) commands as specified by IEEE Std 1003.1-2024, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems.
The "constructor" for lists is of course called list. It's recommended to use when elements come from variable or command substitution (braces won't do that). As Tcl commands are lists anyway, the following is a full substitute for the list command:
Commands can be connected using a pipe, which causes the output of one command to be fed into the input of the next. Both commands run concurrently. | means connect stdout to stdin of the next command. Errors still come to the shell window. |& means connect both stdout and stderr to stdin of the next command. Running concurrently means "in ...
For instance, in MS-based interpreters, a variable reference in code is left in string format; the variable VAR would be represented in memory by the three ASCII characters "VAR". During execution, when this variable is encountered in the code the interpreter has to look up that string in a table of variables, find the associated storage ...
A snippet of C code which prints "Hello, World!". The syntax of the C programming language is the set of rules governing writing of software in C. It is designed to allow for programs that are extremely terse, have a close relationship with the resulting object code, and yet provide relatively high-level data abstraction.
union operator. used to group nodesets in XPath expressions. select attributes of elements such as xsl:when, xsl:if, xsl:for-each. & and any conditional or match criterion, for example xsl:if.test, xsl:when.test, xsl:template.select and xsl:for-each.select. <!--begin comment. anywhere not in a tag. --> end comment. anywhere not in a tag ...