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The cat command outputs the entire text of a file to the screen at once This presents a problem when the file is large because its text quickly speeds past on the screen The more and less commands are designed to overcome this limitation by displaying one screen of text at a time You can then move forward or backward in the text at your leisure You invoke the more or less command by entering the command name followed by the name of the file you want to view (less is a more powerful and configurable display utility)
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$ less mydata
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When more or less invokes a file, the first screen of text is displayed To continue to the next screen, you press the F key or the SPACEBAR To move back in the text, you press the B key You can quit at any time by pressing the Q key
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6:
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Execution Lists file and directory names Displays a file It can take filenames for its arguments It outputs the contents of those files directly to the standard output, which, by default, is directed to the screen Displays a file screen by screen Press the SPACEBAR to continue to the next screen and q to quit Displays a file screen by screen Press the SPACEBAR to continue to the next screen and q to quit
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more filenames less filenames lpr filenames lpq lprm
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PART II
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Sends a file to the line printer to be printed; a list of files may be used as arguments Use the -P option to specify a printer Lists the print queue for printing jobs Removes a printing job from the print queue
TABLE 6-2 Listing, Displaying, and Printing Files
Printing Files: lpr, lpq, and lprm
With the printer commands such as lpr and lprm, you can perform printing operations such as printing files or canceling print jobs (see Table 6-2) When you need to print files, use the lpr command to send files to the printer connected to your system In the next example, the user prints the mydata file:
$ lpr mydata
If you want to print several files at once, you can specify more than one file on the command line after the lpr command In the next example, the user prints out both the mydata and preface files:
$ lpr mydata preface
Printing jobs are placed in a queue and printed one at a time in the background You can continue with other work as your files print You can see the position of a particular printing job at any given time with the lpq command, which gives the owner of the printing job (the login name of the user who sent the job), the print job ID, the size in bytes, and the temporary file in which it is currently held If you need to cancel an unwanted printing job, you can do so with the lprm command, which takes as its argument either the ID number of the printing job or the owner s name It then removes the print job from the print queue For this task, lpq is helpful, for it provides you with the ID number and owner of the printing job you need to use with lprm
Managing Directories: mkdir, rmdir, ls, cd, and pwd
You can create and remove your own directories, as well as change your working directory, with the mkdir, rmdir, and cd commands Each of these commands can take as its argument the pathname for a directory The pwd command displays the absolute pathname of your
Part II:
The Linux Shell and File Structure
working directory In addition to these commands, the special characters represented by a single dot, a double dot, and a tilde can be used to reference the working directory, the parent of the working directory, and the home directory, respectively Taken together, these commands enable you to manage your directories You can create nested directories, move from one directory to another, and use pathnames to reference any of your directories Those commands commonly used to manage directories are listed in Table 6-3
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