In the example below, the filesize is just under 2KB: -rw-r-r- 1 user owner 1985 16:48 index.php. The file size in the fifth column, and is displayed in bytes. This exit status is used in control structures like if. ls -l filename will give you lots of information about a file, including its file size, permissions and owner. The exit status of a command is caught in the pseudo variable $? and is available until you complete another command. While there is only one way to succeed, but always more than way to fail. Control structures in the shell do not require comparisonsĮvery command in the shell returns an exit codeĪny properly coded command in the shell will return 0 for success,Īnd non-zero for failure.In general, shells and their utilities aren't geared towards dealing with binary files. Dash 0.5.5 and pdksh 5.2 have the same behavior, and ATT ksh stops reading at the first null byte. As of bash 4.1, null bytes are simply dropped from the result of the command substitution. Every command in the shell returns an true (0) or false exit code Bash, like most shells, is bad at dealing with null bytes.I actually think this is an important question, as it highlights some important rules in shell programming:
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