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Special Forums UNIX Desktop Questions & Answers Help with Linux shell Post 302860299 by red20132014 on Saturday 5th of October 2013 02:36:22 PM
Old 10-05-2013
Help with Linux shell

Taking a class and having trouble with this whole section.

1. What is the name of the action the shell performs on your command-line after you hit the ENTER key (i.e., to cut your command-line syntax into its constituent tokens, including its commands, options and arguments)?
Hint: It is a word that begins with a “p”

2. What is the name of the important shell variable that is used to find where the command you entered might be stored in the file system, allowing you to make changes to these locations as needed (i.e., to add your own, personal ~/bin directory to the search list)?
Hint: It is a word that begins with a “P”


3. Figure out what the following sequence of commands is trying to accomplish - that is, the end result - and write a single command-line syntax to achieve the same result, using sort as a filter (i.e., don't use sort as the first command), and without creating any new files at all (that is, other than the one that already existed before you started your command-line, and that serves as the input in this example). Do not create and then delete files in your solution. Type your command-line solution:
Hint: Do not use any temp files...

$ sort list > temp
$ lpr temp
$ rm temp
 

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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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