Nested backticks require escaping the inner ones with \. It is recommended for all scripts, large or The ShellCheck project identifies common bugs and # (Consult `man bash` for the nit-grits -) ( set - 1 "2 two" "3 three tres" echo $# set - " $* " echo " $#, " ) ( set - 1 "2 two" "3 three tres" echo $# set - " " echo " $#, " ) # * "$*" expands to one argument, with all args joined # by (usually) spaces, # so no args provided will result in one empty string # being passed on. # Globals: # BACKUP_DIR # ORACLE_SID # Arguments: # None # function cleanup () # For passing on arguments, # is right almost every time, and # $* is wrong almost every time: # * $* and will split on spaces, clobbering up arguments # that contain spaces and dropping empty strings # * will retain arguments as-is, so no args # provided will result in no args being passed on # This is in most cases what you want to use for passing # on arguments. # Cleanup files from the backup directory. This makes it easier to separate normal status from actual issues.Ī function to print out error messages along with other status Use sudo to provide elevated access if you need it. Which is why we’re being explicit about banning it. Make it difficult to run SUID, it’s still possible on some platforms Impossible to secure sufficiently to allow SUID/SGID. There are too many security issues with shell that make it nearly SUID and SGID are forbidden on shell scripts. This allows library files with identical purposes butĭifferent languages to be identically named except for the Sometimes there’s a need to have similar libraries in different However, for libraries it’s important to know what language it is and It is not necessary to know what language a program is written in whenĮxecuting it and shell doesn’t require an extension so we prefer not Maintainable by people other than its author.Įxecutables should have no extension (strongly preferred) or a To switch languages) consider whether the code is easily When assessing the complexity of your code (e.g.Rewrite your script early to avoid a more Rewrite it in a more structured language now. That uses non-straightforward control flow logic, you should If you are writing a script that is more than 100 lines long, or.
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