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Homework and Emergencies Homework & Coursework Questions changing permissions of a file whos name was passed to 755 Post 302398451 by methyl on Wednesday 24th of February 2010 05:02:46 PM
Old 02-24-2010
Some clues to get you started.

If an executable script called "myscript" was invoked from the command line as
Code:
./myscript myfilename 755

we can save the parameters into named environment variables called say filename from $1 and the permissions parameter (755) from $2.

Code:
filename="$1"
echo "The first parameter is: ${filename}"
perms="$2"
echo "The second parameter is: ${perms}"

If we want to find out the current directory listing for the file myfile we can extend the script by one line. Any line starting with a hash character (#) a comment line and will be ignored by the shell.

Code:
filename="$1"
echo "The first parameter is: ${filename}"
perms="$2"
echo "The second parameter is: ${perms}"
# Directory listing for file called myfile
ls -la "${filename}"

Now we understand script parameters, we can take the saved $2 (now called ${perms} ) and substitute it into a unix chmod command.

Your turn!

Last edited by methyl; 02-24-2010 at 06:16 PM.. Reason: After discussion with colleagues decided to put 755 on the command call to point the way.
 

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ch_rc(1M)																 ch_rc(1M)

NAME
ch_rc - change system configuration file SYNOPSIS
root] {parameter|parameter=value}...] [file...] DESCRIPTION
manages the addition, modification, removal, and retrieval of information stored in files having the format of those in the directory. Parameter names are treated as strings. Thus, has no special meaning to in relation to other parameters named Options file Specify the file(s) to be used as the configuration database. If no file is specified, the set of files used by defaults to and all files in the directory. Modification and deletion of configuration parameters occurs in the file where the parameter is found. Add or modify a parameter definition. For each parameter specified on the command line, if the parameter is found in the specified (or default) files, it is modified to reflect the speci- fied value. If the parameter is not found, it is added to the specified file(s). If a new parameter is being defined, one or more files must be specified on the command line; the specified files are those in which the parameter will be defined. Remove a parameter definition. For each parameter name specified on the command line, remove any occurrence of that parameter from the specified file(s). List configuration values. For each parameter specified on the command line, output every definition of the parameter from the specified file(s). Output consists of only the values, one per line. Specify a parameter name or name/value pair. If a name and value is expected, but only a name is specified, the value will be set to the empty string. For example, specifying or will result in and respectively. Due to shell quoting rules, if you need a quoted parameter value, you must protect the quotes from the shell. For exam- ple, yields: which is an error, whereas, yields: Verbose. When used with the option, the option causes a verbose listing to be output. This listing includes a filename followed by the entire line containing the specified parameter for each occurrance of the parameter. The option is used to list all occurances of array parameters matching the parameters specified on the command line. For example, may emit the following output: Normally, the files specified on the command line are used as specified. By specifying a root directory with the option, all files (including the default files if none are specified) will be interpreted relative to root. For example, if root is specified as and is specified on the command line, it will be interpreted as RETURN VALUE
exits with one of the following values: 0 add/delete/list successful 1 command line syntax/usage error 2 can not access one or more of the listed (or default) files 3 can not open/create/write file 4 memory error 5 no files specified on command line for add option EXAMPLES
Files in the directory have the following format: WARNINGS
does not interpret configuration files; it only does pattern matching. As a result, if comments appear on lines containing parameter defi- nitions, the comments will also appear in output when using the option. cannot parse multiple parameter definitions which occur on the same line of a file. AUTHOR
was developed by HP. FILES
system configuration database driver file directory containing system configuration files SEE ALSO
rc.config(4). ch_rc(1M)
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