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Top Forums Shell Programming and Scripting How to remove blank lines in a file and save the file with same name? Post 302588775 by vel4ever on Tuesday 10th of January 2012 01:40:35 AM
Old 01-10-2012
How to remove blank lines in a file and save the file with same name?

I have a text file which has blank lines. I want them to be removed before upload it to DB using SQL *Loader. Below is the command line, i use to remove blank lines.

Code:
sed '/^ *$/d' /loc/test.txt

If i use the below command to replace the file after removing the blank lines, it replace the existing file with a blank file.

Code:
sed '/^ *$/d' /loc/test.txt > /loc/test.txt

 

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ISALNUM_L(3)						   BSD Library Functions Manual 					      ISALNUM_L(3)

NAME
isalnum_l, isalpha_l, isblank_l, iscntrl_l, isdigit_l, isgraph_l, ishexnumber_l, isideogram_l, islower_l, isnumber_l, isphonogram_l, isprint_l, ispunct_l, isrune_l, isspace_l, isspecial_l, isupper_l, isxdigit_l -- character classification utilities LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <wctype.h> #include <xlocale.h> int isalnum_l(int c, locale_t loc); int isalpha_l(int c, locale_t loc); int isblank_l(int c, locale_t loc); int iscntrl_l(int c, locale_t loc); int isdigit_l(int c, locale_t loc); int isgraph_l(int c, locale_t loc); int ishexnumber_l(int c, locale_t loc); int isideogram_l(int c, locale_t loc); int islower_l(int c, locale_t loc); int isnumber_l(int c, locale_t loc); int isphonogram_l(int c, locale_t loc); int isprint_l(int c, locale_t loc); int ispunct_l(int c, locale_t loc); int isrune_l(int c, locale_t loc); int isspace_l(int c, locale_t loc); int isspecial_l(int c, locale_t loc); int isupper_l(int c, locale_t loc); int isxdigit_l(int c, locale_t loc); DESCRIPTION
These functions are extended locale versions of the corresponding functions, with the _l removed. Also, see xlocale(3) for more information about extended locales. SEE ALSO
isalnum(3), isalpha(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), ishexnumber(3), isideogram(3), islower(3), isnumber(3), isphonogram(3), isprint(3), ispunct(3), isrune(3), isspace(3), isspecial(3), isupper(3), isxdigit(3), xlocale(3) BSD
March 11, 2005 BSD
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