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Editing a FreeBSD shell script for configuring ipfirewall. A shell script is a computer program designed to be run by a Unix shell, a command-line interpreter. [1] The various dialects of shell scripts are considered to be command languages.
Tab-separated values (TSV) is a simple, text-based file format for storing tabular data. [3] Records are separated by newlines, and values within a record are separated by tab characters. The TSV format is thus a delimiter-separated values format, similar to comma-separated values.
In computer science, a for-loop or for loop is a control flow statement for specifying iteration. Specifically, a for-loop functions by running a section of code repeatedly until a certain condition has been satisfied. For-loops have two parts: a header and a body. The header defines the iteration and the body is the code executed once per ...
In computing, Bash (short for "Bourne Again SHell,") [6] is an interactive command interpreter and command programming language [7] developed for UNIX-like operating systems.. Created in 1989 [8] by Brian Fox for the GNU Project, [9] it is supported by the Free Software Foundation [10] and designed as a 100% [11] free alternative for the Bourne shell (sh) [12] and other proprietary Unix sh
Some programming languages provide a statement such as break (most languages), Exit (Visual Basic), or last (Perl), which effect is to terminate the current loop immediately, and transfer control to the statement immediately after that loop. Another term for early-exit loops is loop-and-a-half.
When it has completed its operation for the last file, paste will output a newline character and move on to the next line. paste exits after all streams return end of file. The number of lines in the output stream will equal the number of lines in the input file with the largest number of lines. Missing values are represented by empty strings.
Ctrl+k : Clears the line content after the cursor and copies it into the clipboard. Ctrl+l : Clears the screen content (equivalent to the command clear). Ctrl+n : recalls the next command (equivalent to the key ↓). Ctrl+o : Executes the found command from history, and fetch the next line relative to the current line from the history for editing.
According to the Open Group Base Specifications, IFS is an abbreviation for "input field separators." [1] A newer version of this specification mentions that "this name is misleading as the IFS characters are actually used as field terminators."