Part III Using the Command Line in SUSE Linux in .NET

Assign Code 128A in .NET Part III Using the Command Line in SUSE Linux
Part III Using the Command Line in SUSE Linux
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user@bible:~ > cat file |tr a-z mnopqrstuvwxyzabcdefghijkl dqp qxqbtmzf, dqp iuzq nxgq ymzsa dqp mxnmfdaee
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Here, the tr command performs the simple rot13 cipher on the lowercase letters each letter is moved forward 13 places in the alphabet. Repeating the command restores the original text. With the option -d, tr simply removes the characters that are listed:
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user@bible:~ > cat file | tr -d abcde r lphnt, r win lu mngo r ltross
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With the option -s, tr removes repeats of the characters that are listed:
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user@bible:~ > cat repeats aaabcd abbbcd abcccd abcddd user@bible:~ > cat repeats|tr -s ab abcd abcd abcccd abcddd
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Repeated a s and b s have been lost.
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dos2unix and unix2dos
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DOS and Windows have a different convention for newlines from Unix and Linux. In DOS, the newline character is a carriage return and a line feed, whereas in Unix it is just a linefeed. What this means is that there can be problems when dealing with files from one system on the other. The programs dos2unix and unix2dos will convert (by default in place ) a file from one system of newlines to the other. For example:
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user@bible:~ > unix2dos INDEX
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This will silently overwrite the original file with its Unix-style line endings with the DOS version (which you can give to your friend so he can read it in Notepad without embarrassment). If you want to keep the original file, both dos2unix and unix2dos have a -n option that allows you to specify an output file:
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user@bible:~ > unix2dos -n INDEX INDEX.txt unix2dos: converting file INDEX to file INDEX.txt in DOS format ...
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You can, in fact, achieve the same result as dos2unix with tr like this:
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cat file.txt |tr -d \15 >outfile
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This removes the carriage return character that has the decimal value 13 represented by octal \15.
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10 Text Manipulation
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Formatting Text Files for Viewing and Printing
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The commands illustrated in this section offer ways to take plain text files and tidy them up or present them differently for display or printing.
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The pr command takes a text file and splits it into pages of text separated by a number of newlines with a header on each page. Optionally, it can add a form feed character between the pages for sending the output directly to a printer. For example, using the command with no options:
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user@bible:~ > pr README.txt
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will output pages with a header on each looking like this:
2004-08-10 12:26 INDEX Page 1
fold
The fold command reformats a text file by breaking long lines. By default, the lines will be set to a maximum width of 80 characters. You can set the width of the lines you want in the output with the option -w, but if this is too small, the output may look bad. A case where the fold command is useful is when you have saved a word processor document as plain text. In the text file, each paragraph will be a single line. A command such as fold -w 76 file.txt will break these lines sensibly.
The fmt command takes some text (say an article that you have written in a text editor) and does some sensible reformatting to it. Provided that you have separated paragraphs by empty lines, fmt will combine broken lines and make all lines a sensible length. It can also ensure that words are separated by one space and sentences by two. In the example that follows, the -u option forces uniform spacing in other words, one space between words and two spaces between sentences.
user@bible:~ > cat badfile This is a file with some extra space and its line endings are in mess. We need to reformat it somehow.
user@bible:~ > fmt u badfile This is a file with some extra space and its line endings in a mess. We need to reformat it somehow.
groff -Tascii
The document formatting system groff is used by the man page system to create formatted man pages from their source (which are written in plain text with markup). It can also produce nicely formatted printed output.