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Full Discussion: awk or sed or paste
Top Forums UNIX for Dummies Questions & Answers awk or sed or paste Post 43373 by google on Sunday 16th of November 2003 06:58:59 PM
Old 11-16-2003
The cat command reads the file passed to it and outputs it to standard out. However, in this case, its is "piped" to the command awk. By piped I mean, the output of the command cat is passed as input to the command awk.

The awk programming language uses regular expressions and pattern matching. Its a great tool for parsing text files and the like. The printf statement has the general form:

printf format, expr[1], expr[2], . . ., expr[n]

where format is a string that contains both information to be printed and specifications on what conversions are to be performed on the expressions in the argument list, as in ``awk printf conversion characters''. Each specification begins with a %, ends with a letter that determines the conversion, and may include:
- (the dash) is used to Left-justify an expression in its field.
Character Prints expression as
c single character
d decimal number
e [-]d.ddddddE[+-]dd
f [-]ddd.dddddd
g e or f conversion, whichever is shorter, with nonsignificant zeros suppressed
o unsigned octal number
s string
x unsigned hexadecimal number
% print a %; no argument is converted


Below are some examples of printf statements along with the corresponding output:

printf "%d", 99/2 49
printf "%e", 99/2 4.950000e+01
printf "%f", 99/2 49.500000
printf "%6.2f", 99/2 49.50
printf "%g", 99/2 49.5
printf "%o", 99 143
printf "%06o", 99 000143
printf "%x", 99 63
printf "|%s|", "January" |January|
printf "|%10s|", "January" | January|
printf "|%-10s|", "January" |January |
printf "|%.3s|", "January" |Jan|
printf "|%10.3s|", "January" | Jan|
printf "|%-10.3s|", "January" |Jan |
printf "%%" %

The default output format of numbers is %.6g; this can be changed by assigning a new value to OFMT. OFMT also controls the conversion of numeric values to strings for concatenation and creation of array subscripts.

Last edited by google; 11-16-2003 at 10:24 PM..
 

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ICONV(1)						     Linux Programmer's Manual							  ICONV(1)

NAME
iconv - character set conversion SYNOPSIS
iconv [OPTION...] [-f encoding] [-t encoding] [inputfile ...] iconv -l DESCRIPTION
The iconv program converts text from one encoding to another encoding. More precisely, it converts from the encoding given for the -f option to the encoding given for the -t option. Either of these encodings defaults to the encoding of the current locale. All the input- files are read and converted in turn; if no inputfile is given, the standard input is used. The converted text is printed to standard out- put. The encodings permitted are system dependent. For the libiconv implementation, they are listed in the iconv_open(3) manual page. Options controlling the input and output format: -f encoding, --from-code=encoding Specifies the encoding of the input. -t encoding, --to-code=encoding Specifies the encoding of the output. Options controlling conversion problems: -c When this option is given, characters that cannot be converted are silently discarded, instead of leading to a conversion error. --unicode-subst=formatstring When this option is given, Unicode characters that cannot be represented in the target encoding are replaced with a placeholder string that is constructed from the given formatstring, applied to the Unicode code point. The formatstring must be a format string in the same format as for the printf command or the printf() function, taking either no argument or exactly one unsigned integer argument. --byte-subst=formatstring When this option is given, bytes in the input that are not valid in the source encoding are replaced with a placeholder string that is constructed from the given formatstring, applied to the byte's value. The formatstring must be a format string in the same format as for the printf command or the printf() function, taking either no argument or exactly one unsigned integer argument. --widechar-subst=formatstring When this option is given, wide characters in the input that are not valid in the source encoding are replaced with a placeholder string that is constructed from the given formatstring, applied to the byte's value. The formatstring must be a format string in the same format as for the printf command or the printf() function, taking either no argument or exactly one unsigned integer argument. Options controlling error output: -s, --silent When this option is given, error messages about invalid or unconvertible characters are omitted, but the actual converted text is unaffected. The iconv -l or iconv --list command lists the names of the supported encodings, in a system dependent format. For the libiconv implementa- tion, the names are printed in upper case, separated by whitespace, and alias names of an encoding are listed on the same line as the encoding itself. EXAMPLES
iconv -f ISO-8859-1 -t UTF-8 converts input from the old West-European encoding ISO-8859-1 to Unicode. iconv -f KOI8-R --byte-subst="<0x%x>" --unicode-subst="<U+%04X>" converts input from the old Russian encoding KOI8-R to the locale encoding, substituting an angle bracket notation with hexadecimal numbers for invalid bytes and for valid but unconvertible characters. iconv --list lists the supported encodings. SEE ALSO
iconv_open(3) GNU
January 22, 2006 ICONV(1)
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