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Top Forums UNIX for Dummies Questions & Answers Commenting a line matched with a specific string in a file Post 302894864 by bakunin on Thursday 27th of March 2014 04:37:32 PM
Old 03-27-2014
Quote:
Originally Posted by raosr020
I would like to comment a line that matched a string "sreenivas" in a file without opening it.
This won't work, because to find out if there is such line you will definitely have to open it somehow.

If you mean "without interactively opening" and assuming you use "#" as a comment sign (beware - there are some formats with other comment signs), try:

Code:
sed '/sreenivas/ s/^/# /' /path/to/input > /path/to/output

I hope this helps.

bakunin
 

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std::sub_match< _BiIter >(3cxx) 										   std::sub_match< _BiIter >(3cxx)

NAME
std::sub_match< _BiIter > - SYNOPSIS
Inherits std::pair< _BiIter, _BiIter >. Public Types typedef iterator_traits < _BiIter >::difference_type difference_type" typedef _BiIter first_type typedef _BiIter iterator typedef _BiIter second_type typedef std::basic_string < value_type > string_type" typedef iterator_traits < _BiIter >::value_type value_type" Public Member Functions int compare (const sub_match &__s) const int compare (const string_type &__s) const int compare (const value_type *__s) const difference_type length () const operator string_type () const string_type str () const void swap (pair &__p) Public Attributes _BiIter first bool matched _BiIter second Detailed Description template<typename _BiIter>class std::sub_match< _BiIter > A sequence of characters matched by a particular marked sub-expression. An object of this class is essentially a pair of iterators marking a matched subexpression within a regular expression pattern match. Such objects can be converted to and compared with std::basic_string objects of a similar base character type as the pattern matched by the regular expression. The iterators that make up the pair are the usual half-open interval referencing the actual original pattern matched. Definition at line 757 of file regex.h. Member Typedef Documentation typedef _BiIter std::pair< _BiIter , _BiIter >::second_type [inherited] first_type is the first bound type Definition at line 90 of file stl_pair.h. Member Function Documentation template<typename _BiIter> int std::sub_match< _BiIter >::compare (const sub_match< _BiIter > &__s) const [inline] Compares this and another matched sequence. Parameters: s Another matched sequence to compare to this one. Return values: <0 this matched sequence will collate before s. =0 this matched sequence is equivalent to s. <0 this matched sequence will collate after s. Definition at line 818 of file regex.h. Referenced by std::operator!=(), std::operator<(), std::operator<=(), std::operator==(), std::operator>(), and std::operator>=(). template<typename _BiIter> int std::sub_match< _BiIter >::compare (const string_type &__s) const [inline] Compares this sub_match to a string. Parameters: s A string to compare to this sub_match. Return values: <0 this matched sequence will collate before s. =0 this matched sequence is equivalent to s. <0 this matched sequence will collate after s. Definition at line 831 of file regex.h. template<typename _BiIter> int std::sub_match< _BiIter >::compare (const value_type *__s) const [inline] Compares this sub_match to a C-style string. Parameters: s A C-style string to compare to this sub_match. Return values: <0 this matched sequence will collate before s. =0 this matched sequence is equivalent to s. <0 this matched sequence will collate after s. Definition at line 844 of file regex.h. template<typename _BiIter> difference_type std::sub_match< _BiIter >::length () const [inline] Gets the length of the matching sequence. Definition at line 775 of file regex.h. template<typename _BiIter> std::sub_match< _BiIter >::operator string_type () const [inline] Gets the matching sequence as a string. Returns: the matching sequence as a string. This is the implicit conversion operator. It is identical to the str() member function except that it will want to pop up in unexpected places and cause a great deal of confusion and cursing from the unwary. Definition at line 788 of file regex.h. template<typename _BiIter> string_type std::sub_match< _BiIter >::str () const [inline] Gets the matching sequence as a string. Returns: the matching sequence as a string. Definition at line 801 of file regex.h. Referenced by std::sub_match< _Bi_iter >::compare(), and std::operator<<(). Member Data Documentation _BiIter std::pair< _BiIter , _BiIter >::first [inherited] second_type is the second bound type Definition at line 92 of file stl_pair.h. Referenced by std::sub_match< _Bi_iter >::length(), std::sub_match< _Bi_iter >::operator string_type(), and std::sub_match< _Bi_iter >::str(). _BiIter std::pair< _BiIter , _BiIter >::second [inherited] first is a copy of the first object Definition at line 93 of file stl_pair.h. Referenced by std::sub_match< _Bi_iter >::length(), std::sub_match< _Bi_iter >::operator string_type(), and std::sub_match< _Bi_iter >::str(). Author Generated automatically by Doxygen for libstdc++ from the source code. libstdc++ Tue Nov 27 2012 std::sub_match< _BiIter >(3cxx)
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