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Top Forums Shell Programming and Scripting search a line and insert string into specific at position Post 302299693 by daikeyang on Friday 20th of March 2009 09:51:45 PM
Old 03-20-2009
search a line and insert string into specific at position

Hi, guys. I have one question:

How can I search for a line with certain string in it and then insert a string into this line?
For example:

There is a file called shadow, the contents of it are below:

**************************
...
yuanz:VIRADxMsadfDF/Q:0:0:50:7:::
sherrys:ASdfe#$DfdadfFAd:0:0:50:7:::
brownj:ADdfTRMnD$%3dfa:0:0:50:7:::
...
**************************

A variable called $user, another variable called $string. I want to search the line which has $user in it, and add $string at the beginning of the second column. If $user is brownj, and $string is STRING_, then the line will be:

brownj:STRING_ADdfTRMnD$%3dfa:0:0:50:7:::

I use the following code, but it doesn't work

sed 's/^$user:/$user:$string/' shadow

Can anybody help me with this?

Thank you very much for your time in advance

-Keyang
 

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curs_deleteln(3X)														 curs_deleteln(3X)

NAME
deleteln, wdeleteln, insdelln, winsdelln, insertln, winsertln - delete and insert lines in a curses window SYNOPSIS
#include <curses.h> int deleteln(void); int wdeleteln(WINDOW *win); int insdelln(int n); int winsdelln(WINDOW *win, int n); int insertln(void); int winsertln(WINDOW *win); DESCRIPTION
The deleteln and wdeleteln routines delete the line under the cursor in the window; all lines below the current line are moved up one line. The bottom line of the window is cleared. The cursor position does not change. The insdelln and winsdelln routines, for positive n, insert n lines into the specified window above the current line. The n bottom lines are lost. For negative n, delete n lines (starting with the one under the cursor), and move the remaining lines up. The bottom n lines are cleared. The current cursor position remains the same. The insertln and winsertln routines, insert a blank line above the current line and the bottom line is lost. RETURN VALUE
All routines return the integer ERR upon failure and an OK (SVr4 specifies only "an integer value other than ERR") upon successful comple- tion. PORTABILITY
These functions are described in the XSI Curses standard, Issue 4. The standard specifies that they return ERR on failure, but specifies no error conditions. NOTES
Note that all but winsdelln may be macros. These routines do not require a hardware line delete or insert feature in the terminal. In fact, they won't use hardware line delete/insert unless idlok(..., TRUE) has been set on the current window. SEE ALSO
curses(3X) curs_deleteln(3X)
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