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shebang env shebang line shebang unix sheep connect shell args shell arguments shell backslash shell case statement example shell change directory shell check if directory exists shell command line shell commands in linux with example shell commands windows 10 shell comment shell compare string shell console windows shell copy directory shell diff shell dir shell drops program shell echo shell echo color shell echo command shell echo multiple lines shell echo newline shell escape shell escape characters shell escape value care shell eval shell exec shell exec command shell execute command shell find shell function shell function example shell function return shell getopt shell globbing shell shell if shell if file exist shell if file exists shell if not shell if options shell interpreter shell length of string shell list of strings shell ls shell ls command shell manual shell metacharacters shell metacharacters in linux shell metacharacters in unix shell mode shell open file shell open results shell page shell pass arguments shell php jpg shell print command shell printf shell programfiles shell pwd shell quotes shell read shell read command shell read from stdin shell run command shell script 2 1 shell script all arguments shell script arguments example shell script command line shell script command line arguments shell script comment shell script comment block shell script create directory shell script create file with date and time shell script exec shell script execute command shell script exit shell script exit code shell script exit on error shell script file exist shell script file exists shell script file size shell script first line shell script flags shell script fork shell script function shell script getopts shell script getopts multiple arguments shell script if file exists shell script input parameters shell script list of strings shell script ls shell script make directory shell script mkdir shell script mysql query into variable shell script output to file shell script output to screen