Bus errors are rare nowadays on x86 and occur when your processor cannot even attempt the memory access requested, typically: using a processor instruction with an address that does not satisfy its alignment requirements. Segmentation faults occur when accessing memory which does not belong to your process. They are very common and are typically the … Read more
Variable assignments in bash scripts require no space between the variable name and value or (unless quoted) within the value. Since a space was present in the line FILEBACKUPLOCATION= /../…/FMonday, it attempted to execute /../…/FMonday as a command (which caused the first error) with FILEBACKUPLOCATION assigned to an empty string. The variable was then not assigned when the other command … Read more
If your source directory is set in quotes, then make sure that the * is outside the quotes, i.e. or
You need to change the directory permission so that web server process can change the directory. To change ownership of the directory, use chown:chown -R user-id:group-id /path/to/the/directory To see which user own the web server process (change httpd accordingly):ps aux | grep httpd | grep -v grep ORps -efl | grep httpd | grep -v grep
From man grep: -a, –text Process a binary file as if it were text; this is equivalent to the –binary-files=text option. –binary-files=TYPE If the first few bytes of a file indicate that the file contains binary data, assume that the file is of type TYPE. By default, TYPE is binary, and grep normally outputs either a … Read more
Brace expansion, {x..y} is performed before other expansions, so you cannot use that for variable length sequences. Instead, use the seq 2 $max method as user mob stated. So, for your example it would be:
If you call wait(NULL) (wait(2)), you only wait for any child to terminate. With wait(&status) you wait for a child to terminate but you want to know some information about it’s termination. You can know if the child terminate normally with WIFEXITED(status) for example. status contains information about processes that you can check with some already defined MACRO.
There are two easy and safe rules which work not only in sh but also bash. 1. Put the whole string in single quotes This works for all chars except single quote itself. To escape the single quote, close the quoting before it, insert the single quote, and re-open the quoting. sed command: sed -e “s/’/’\\\\”/g; 1s/^/’/; \$s/\$/’/” 2. … Read more
1277 Try: Or alternatively, with the short flags -qr: If you also want to see differences for files that may not exist in either directory:
You don’t have to call the external basename command. Instead, you could use the following commands: Note that this solution should work in all recent (post 2004) POSIX compliant shells, (e.g. bash, dash, ksh, etc.). Source: Shell Command Language 2.6.2 Parameter Expansion More on bash String Manipulations: http://tldp.org/LDP/LG/issue18/bash.html