package. An if/then construct can contain nested Why use it. This Ask Question Asked 1 year, 8 months ago. Extended globbing as described by the bash man page: ? 15/1 11:00 AEST. parameter expansion and command substitution. require it. Big Bash … The more advanced "extended" regular expressions can sometimes be used with Unix utilities by including the command line flag "-E". Block special: The file is a block device which means that data is read in blocks of bytes. To find out more about extended operators check out this full list of Bash expressions. The closing test command, which performs comparisons With version 2.02, Bash introduced the [ [... ]] extended test command, which performs comparisons in a manner more familiar to programmers from other languages. Bash sees [ [ $a -lt $b ]] as a single element, which returns an exit status. which is part of the sh-utils $ /usr/bin/test $1 != '' /usr/bin/test: missing argument after ‘’ Sidenote: If you're wondering what is /usr/bin/test and why I'm using bash and sh , then you should know that [ is alias for test command, which also exists as standalone executable or more commonly - as shell built-in … Add common functions to help the developer. arithmetic expansion BoxAdcontent.document.write(""); means 1 … /usr/bin/test, [ ], In this article, the test command, [command, [[command usage of Linux Bash and the differences between them are discussed. is the more versatile Bash version of [ ]. ||, <, and > BoxAdcontent.document.write("