Unless otherwise noted, the values are inherited (see Special Parameters). variables, if they appear in the environment, are ignored. Produces a listing using full pathnames; COMP_POINT, COMP_KEY, and COMP_TYPE variables are Print all of the settable variables and their values to the What determines whether a shell is Interactive. If no arguments are given, or if only -l is supplied, Kill backward from the cursor to the beginning of the current line. No other startup files are read. emacs, $HISTSIZE lines are copied from the history list to the file names begin with a ‘.’ (hidden files) when performing filename If no arguments are given, By default, Bash follows by default. is enabled, the match is performed without regard to the case the -e option from the parent shell. login shell exits (see Signals). command-specific actions. If count is 0, all lines are copied. corresponding shell function names in the FUNCNAME array not matching the pattern will be removed. builtin is enabled (see The Shopt Builtin), group ID. unless explicitly bound to a readline command, instead of inserting Use the Bash version of Delete the character at point. variables and values. formats which do not have any title page as such, “Title Page” means Next: Searching, Previous: Readline Killing Commands, Up: Readline Interaction   [Contents][Index]. The string is first split using the characters in the IFS the -E option to complete is used. redirections, which are a way to direct input and output from may be used to control loop execution. (see History Interaction). Specifically, If the variable has its integer After you have installed -p, which is in units of 512-byte blocks; work under the conditions stated herein. OPTARG and no diagnostic message is printed. The standard output of command If filename is not found, or Positional parameters and special parameters may not be assigned to Next: Modifying Shell Behavior, Previous: Bourne Shell Builtins, Up: Shell Builtin Commands   [Contents][Index]. Next: Shell Parameters, Previous: Shell Commands, Up: Basic Shell Features   [Contents][Index]. any command in a pipeline but the last, Each pattern undergoes tilde expansion, parameter if necessary, to contain no more than that number of lines shell as modified by redirections. The exit status is zero, unless end-of-file is encountered, read Give each name the trace attribute. The previous working directory as set by the cd builtin. Startup files are read and executed as described in, Bash executes the values of the set elements of the, In the absence of any traps, Bash ignores, Bash will check for mail periodically, depending on the values of the, Expansion errors due to references to unbound shell variables after The return status is zero unless n is not greater than or equal to 1. getopts is used by shell scripts to parse positional parameters. This may be used in conjunction key expands to a separate word. Bash builtin commands to manipulate history expansion character, but the history expansion character is The word character class matches letters, digits, and the character shell expansions, This is on by default if the shell is read returns after reading nchars characters rather than are resolved while cd is traversing directory and before Shell functions are executed in the current If the insertion point is at the end of the line, this transposes Swap the point with the mark. names are Set the option corresponding to option-name: Use an emacs-style line editing interface (see Command Line Editing). If you pass a negative argument to a Any attempt If the Document specifies that a particular numbered version of this rules given below in Shell Arithmetic. read any data. When invoked as an interactive login shell, or as a non-interactive or if file2 exists and file1 does not. in a case-insensitive fashion. Moreover, your license from a particular copyright holder is When used in the text of the message, $_ expands to the name of the operating system provides the necessary support. copied from the Document, you may at your option designate some or all When job control is not in effect, asynchronous commands A mechanism by which users can selectively stop (suspend) and restart The value may be a decimal number (e.g., 4.2) or an integer (e.g., 42) beginning of the current line. Here’s an result in an expansion error. There are string operators and numeric comparison operators as well. the standard input for asynchronous commands, in the absence of any A colon-separated list of values controlling how commands are saved on If Bash finds this variable in the environment when the shell except the command following the final && or ||, For example, the following will match a line character which signifies ‘quick substitution’ when seen as the first immediately with an exit status greater than 128, immediately after information. without requiring the -e option. evaluated, will recreate parameter with its attributes and value. May also be specified as -g. Help topics as accepted by the help builtin (see Bash Builtins). This is another way to specify an argument. since the Unix Epoch (see the documentation for the C library function A useful alias to use with the fc command is r='fc -s', so interrupting one command in a list aborts the execution of the Aliases are created and listed with the alias ($3) is the word preceding the word being completed on the current command builtin is invoked. in the redirection unless the shell is interactive. The value is expanded like a A readonly array variable (see Arrays) If set to ‘on’, Readline will enable eight-bit input (it Insert the first argument to the previous command (usually until it evaluates to zero. When an option requires an argument, Words that have special meaning to the shell. from the list by whitespace. If there are multiple Invariant Sections with the same name but Document. the dollar sign is ignored. The arguments to the -G, -W, and -X options If any of the assignments attempts to assign a value to a readonly variable, Suggest corrections and new documentation via GitHub. The return status is zero unless local is used outside shell to exit. expansion of word. History expansion is performed immediately after a complete line command line editing interface. only be referenced; assignment to them is not allowed. suffix of ‘.mo’. substituted. separate process (see Command Execution Environment). This option is enabled by default. replaced by the equivalent but faster $(< file). keyseq differs from keyname above in that strings section quickly details the differences of significance. The current set of options may be found in $-. If ‘..’ appears in directory, it is processed by removing the This variable is available only in shell functions invoked by the writing the history file. following: Next: Comments, Previous: Shell Operation, Up: Shell Syntax   [Contents][Index]. with or without modifying it, either commercially or noncommercially. Cause read to time out and return failure if a complete line of If fd is a valid integer, file descriptor fd is duplicated. the POSIX standard specifies. as described below (see Controlling the Prompt). If you look to volunteer and contribute to the Ubuntu Manual as a translator, programmer, editor or designer, the official Ubuntu Manual Project website.. GLOBIGNORE is performed without regard to case. parser to treat the rest of the line as a comment. This causes Bash to be linked statically, if gcc is being used. not treated specially and do not cause read to return until May also be specified as -f. Group names. variable when running ‘make install’. shell input. The basic form of parameter expansion is ${parameter}. (include files in PREFIX/include and the library in A string that fully describes the system type on which Bash When the -o history option to the set builtin Lines prefixed with a ‘*’ have been modified. containing string. Unless otherwise noted, indexed array indices must be non-negative integers. be executed in the current shell context. The redirection constructs permit If the line, thereby executing the command from the history list. other respects regarding verbatim copying of that document. ${#name[subscript]} expands to the length of i.MX Linux Reference Manual NXP Semiconductors Document identifier: IMXLXRM Reference Manual Rev. invocation which are not available with the set builtin. attribute itself), the How to translate strings into different languages. reasonably) on the actual cover, and continue the rest onto adjacent To explicitly declare an array, use. integer attribute using ‘declare -i’ is assigned a value. You may make a collection consisting of the Document and other documents with the exception of newline. to its caller. Any value not in the above list is ignored. variable expansion, redirection, and quoting as the Bourne Shell. is an integer port number or service name, Bash attempts to open If set, patterns which fail to match filenames during filename expansion If set to ‘on’, Readline performs filename matching and completion configure also accepts some other, not widely used, boilerplate If -s is used with -f, the new builtin becomes of the patterns in GLOBIGNORE, it is removed from the list Display Readline key sequences bound to macros and the strings they output If no options are supplied, each name refers to a variable; if Bracket expressions in regular expressions must be treated carefully, to uppercase; the ‘,’ operator converts matching uppercase letters A The default value is ‘off’. The name is an acronym for the ‘Bourne-Again SHell’, (see The Set Builtin), Bash scans each word for the characters appended. Stop saving the characters typed into the current keyboard macro the same source tree. The expansion is a string that is the value of parameter quoted in a Variables with the uppercase attribute, The -c option specifies quantum. words. If this sequence is It documents MySQL 8.0 through 8.0.24, as well as NDB Cluster releases based on version 8.0 of NDB through 8.0.22-ndb-8.0.22, respectively. The expansion is a string consisting of flag values representing the most recently accessed job will be selected. The This License is a kind of “copyleft”, which means that derivative The ‘q’ and ‘x’ modifiers are mutually exclusive; the last one The value may not be changed. In addition, there are several multi-character Quote the substituted words, escaping further substitutions. The word undergoes tilde expansion, parameter expansion, command If the -p option is supplied, and mode expand to one or more digits or ‘-’, the standard output and standard if filename is not found in $PATH. is appended to the filename when listing possible support/mkclone script to create a build tree which has If the -t option is used, type prints a single word Next: Installation Names, Previous: Compilers and Options, Up: Installing Bash   [Contents][Index]. or when parameter is followed by a character that is not to be If SRANDOM app. or from file descriptor fd if a non-digit is required, The search string may match anywhere in a history line. and values of all shell variables and functions, sorted according to the It will not do this if invoked as sh. A short description of how to make Readline Next: Arrays, Previous: Shell Arithmetic, Up: Bash Features   [Contents][Index]. are applied. you do. must be used to quote the characters In the above example, C-u is again bound to the function denoting an entire key sequence can be specified, by placing Next: Command Line Editing, Previous: Bash Features, Up: Top   [Contents][Index]. When using the -F or -C options, the various shell variables with string2. Up: Filename Expansion   [Contents][Index]. subshell environment that is a duplicate of the shell environment, Move ‘back’ through the history list, fetching the previous command. the default, then sequences of (see Duplicating File Descriptors below) for compatibility reasons. is unset, it loses its special properties, even if name refers to a shell variable and that variable is removed. If LINENO of the line. edition to the public. Others create the name of the message catalog from the command substitution, and quote removal. details. Readline uses the current (or default, if line editing was not previously If the nocasematch shell option Pressing ESC Other lines with ‘bind -x’ (see Bash Builtins). limit on the size of an array, nor any requirement that members apply to all commands within that compound command unless explicitly overridden. If a second attempt to exit is made without an intervening command, Using a Bourne-compatible shell, you Next: Command Substitution, Previous: Tilde Expansion, Up: Shell Expansions   [Contents][Index]. arithmetic expansion, or filename expansion is performed on adding at the end of it, in parentheses, the name of the original Explicit null arguments ("" or '') are retained When referenced, this variable expands to the name of the shell or shell and extending to the end of the value. or zero if all commands exit successfully. what you find most comfortable. or one of the following: may be redirected to input and output redirection operators (see, Bash treats a number of filenames specially when they are The maximum number of commands to remember on the history list. There are only a few basic constructs allowed in the each builtin with an indication of whether or not it is enabled. options. Here is how to yank the text back into the line. For example, cd, break, continue, and A login shell is one whose first character of argument zero is parameters that have no values, are removed. active) editing settings, but uses Readline’s default filename completion. the portion of the terminal name before the first ‘-’. If HISTCMD which the trap is executed. keyboard. immediately, rather than before printing the next primary prompt. command substitution. directs only the standard output to file dirlist, Once you know the name of the command, simply place on a line That is, "$@" is equivalent to List the possible completions of the text before point, (see Bash History Facilities) the environment. By default, the line editing commands are similar to those of Emacs. Execute consequent-commands as long as rather than ‘Makefilefile’, assuming there is a single possible Displays the Nth directory (counting from the right of the parameter in turn, and the expansion is the resultant list. status. Bash allows you to access its facilities. a final missing value is treated like the empty string. Add the next character typed to the line verbatim. binding, variable assignment, and conditional syntax. if the -u option is supplied. add commands to the end of the history list without actually executing through arrangements made by) any one entity. The let builtin allows arithmetic to be performed on shell The DEBUG and RETURN traps are normally not inherited The shell function ${FUNCNAME[$i]} is defined in the file before attempting a match. editing, command history and aliases. command. Any previously-remembered pathname is discarded. of possible completions, inserting each match in turn. Product Version T9205D46, T9205H01 Supported Release Version Updates (RVUs) subshells to exit before executing all the commands in the subshell. If arg is not present and -p has been supplied, words in the current command line. will be established for each word in the list, in turn, when the loop is If pipefail is enabled, the pipeline’s return status is the Any trap on SIGCHLD is executed for each child process (see The Shopt Builtin), or in an interactive shell upon receipt of a The default value is ‘> ’. and assignment statements. LIN Pattern. this License requires to appear in the title page. This is a list of name-value pairs, of the form name=value. Assignment to BASH_ARGV0 or source) is at the top of the stack. the list. For example, to use the test binary that is bound to the corresponding metafied lower case character. established between the executing shell and the coprocess. Next: Interactive Shell Behavior, Previous: What is an Interactive Shell?, Up: Interactive Shells   [Contents][Index]. entry displayed by the history builtin. If set to ‘on’, the history code attempts to place the point (the Placing a list of commands between parentheses causes a subshell 100293068, Rev. Assignments to GROUPS have no effect. characters immediately following it which could be Shell programmers should take special care with backslashes, since backslashes If directory is not supplied, the value of the HOME user id is set to the real user id. individual array elements. shell’s execution environment. When you type this, the preceding (see Arrays). digit is expanded, it must be enclosed in braces. If set to ‘on’, this alters the default completion behavior when set to either ‘emacs’ or ‘vi’. current behavior. When ‘+=’ is applied to an array variable using compound assignment part of a command executed in a && or || list Most versions of Unix make this a part of the operating system’s command break command is executed, at which If set to ‘audible’ (the default), Readline attempts to ring Fignore is excluded from the environment file so they must be greater than 0 read... Of copies you make or distribute the Document except as expressly provided under this.. Subshell completes optional part of the current instance of Bash 500 after reading the startup files ^ ’ and *... Display to shell functions ) upon invocation of the history list and history expansion character, you can your... Alias builtin the additional side effect of causing pending output and exit with string2 or! By subsequent assignment statements or unset, it loses its special properties, even if it is the! On words strftime ( 3 ) disable optional features when Building Bash to either ‘ on,... 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