how to put a # in a file

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Old 12-19-2007
Modify as per ur requirment

sed -e 's/pop3/#pop3/g' -e 's/named/#named/g' -e 's/smtpd/#smtpd/g' /etc/inetd

To replace the first occurace only you can do this

sed -e 's/pop3/#pop3/1' -e 's/named/#named/1' -e 's/smtpd/#smtpd/1' /etc/inetd

If you want insert '#' in the line start with smptd,named,pop3 then u can use this
sed -e 's/^pop3/#pop3/1' -e 's/^named/#named/1' -e 's/^smtpd/#smtpd/1' /etc/inetd
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MBRLEN(3)						   BSD Library Functions Manual 						 MBRLEN(3)

mbrlen, mbrlen_l -- get number of bytes in a character (restartable) LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <wchar.h> size_t mbrlen(const char *restrict s, size_t n, mbstate_t *restrict ps); #include <wchar.h> #include <xlocale.h> size_t mbrlen_l(const char *restrict s, size_t n, mbstate_t *restrict ps, locale_t loc); DESCRIPTION
The mbrlen() function inspects at most n bytes, pointed to by s, to determine the number of bytes needed to complete the next multibyte char- acter. The mbstate_t argument, ps, is used to keep track of the shift state. If it is NULL, mbrlen() uses an internal, static mbstate_t object, which is initialized to the initial conversion state at program startup. It is equivalent to: mbrtowc(NULL, s, n, ps); Except that, when ps is a NULL pointer, mbrlen() uses its own static, internal mbstate_t object to keep track of the shift state. Although the mbrlen() function uses the current locale, the mbrlen_l() function may be passed a locale directly. See xlocale(3) for more information. RETURN VALUES
The mbrlen() functions returns: 0 The next n or fewer bytes represent the null wide character (L''). >0 The next n or fewer bytes represent a valid character, mbrlen() returns the number of bytes used to complete the multibyte character. (size_t)-2 The next n contribute to, but do not complete, a valid multibyte character sequence, and all n bytes have been processed. (size_t)-1 An encoding error has occurred. The next n or fewer bytes do not contribute to a valid multibyte character. EXAMPLES
A function that calculates the number of characters in a multibyte character string: size_t nchars(const char *s) { size_t charlen, chars; mbstate_t mbs; chars = 0; memset(&mbs, 0, sizeof(mbs)); while ((charlen = mbrlen(s, MB_CUR_MAX, &mbs)) != 0 && charlen != (size_t)-1 && charlen != (size_t)-2) { s += charlen; chars++; } return (chars); } ERRORS
The mbrlen() function will fail if: [EILSEQ] An invalid multibyte sequence was detected. [EINVAL] The conversion state is invalid. SEE ALSO
mblen(3), mbrtowc(3), multibyte(3), xlocale(3) STANDARDS
The mbrlen() function conforms to ISO/IEC 9899:1999 (``ISO C99''). BSD
April 7, 2004 BSD