at

The at-job shall be executed in a separate invocation of the shell, running in a separate process group with no controlling terminal, except that the environment variables, current working directory, file creation mask, and other implementation-defined execution-time attributes in effect when the at utility is executed shall be retained and used when the at-job is executed. User notification and the processing of the job's standard output and standard error are described under the -m option. (The letter ell.) Report all jobs scheduled for the invoking user if no at job id operands are specified. If at job id s are specified, report only information for these jobs. The output shall be written to standard output. Send mail to the invoking user after the at-job has run, announcing its completion. Standard output and standard error produced by the at-job shall be mailed to the user as well, unless redirected elsewhere. Mail shall be sent even if the job produces no output. Remove the jobs with the specified at job id operands that were previously scheduled by the at utility. Submit the job to be run at the time specified by the time option-argument, which the application shall ensure has the format as specified by the touch -t time utility. In the POSIX locale, the following describes the three parts of the time specification string. All of the values from the LC TIME categories in the POSIX locale shall be recognized in a case-insensitive manner. Indicates the current day and time. Invoking at shall submit an at-job for potentially immediate execution (that is, subject only to unspecified scheduling delays). The following grammar describes the precise format of timespec in the POSIX locale. The general conventions for this style of grammar are described in Grammar Conventions . This formal syntax shall take precedence over the preceding text syntax description. The longest possible token or delimiter shall be recognized at a given point. When used in a timespec , white space shall also delimit tokens. %token day number / A day number is a number in the range appropriate for the particular month and year specified by month name and year number, respectively. If no year number is given, the current year is assumed if the given date and time are later this year. If no year number is given and the date and time have already occurred this year and the month is not the current month, next year is the assumed year. / [XSI) ] ![[Option Start]]( The text files at.allow and at.deny , which are located in an implementation-defined directory, shall contain zero or more user names, one per line, of users who are, respectively, authorized or denied access to the at and batch utilities. ![[Option End]]( Provide a default value for the internationalization variables that are unset or null. (See XBD Internationalization Variables for the precedence of internationalization variables used to determine the values of locale categories.) If set to a non-empty string value, override the values of all the other internationalization variables. Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments and input files). Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error and informative messages written to standard output. [XSI) ] ![[Option Start]]( Determine the location of message catalogs for the processing of LC MESSAGES. ![[Option End]]( Determine the format and contents for date and time strings written and accepted by at . When standard input is a terminal, prompts of unspecified format for each line of the user input described in the STDIN section may be written to standard output. where date has the same format as that described in the STDOUT section. Neither this, nor warning messages concerning the selection of the command interpreter, shall be cons