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Top Forums Shell Programming and Scripting Copying characters on each line in a file Post 302989239 by dmm on Tuesday 10th of January 2017 09:34:38 AM
Old 01-10-2017
Copying characters on each line in a file

Hello,

I would like to copy the first and third char on each line of a file and place them in the 14h and 17th char positions. The file name is listed first and is 6 char's and the dir name is second and also same char size on each line.

The file has thousands of lines.

Initial file contents:

Code:
 012345 /dmm/0/0/stat-file
 6789AB /dmm/0/0/stat-file
 CDEF01 /dmm/0/0/stat-file

Final contents needed:

Code:
 012345 /dmm/00/02/stat-file
 6789AB /dmm/06/08/stat-file
 CDEF01 /dmm/0C/0E/stat-file


Last edited by joeyg; 01-10-2017 at 10:44 AM.. Reason: Added codetags
 

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GETPW(3)						     Linux Programmer's Manual							  GETPW(3)

NAME
getpw - Re-construct password line entry SYNOPSIS
#include <pwd.h> #include <sys/types.h> int getpw(uid_t uid, char *buf); DESCRIPTION
The getpw() function re-constructs the password line entry for the given user uid uid in the buffer buf. The returned buffer contains a line of format name:passwd:uid:gid:gecos:dir:shell The passwd structure is defined in <pwd.h> as follows: struct passwd { char *pw_name; /* user name */ char *pw_passwd; /* user password */ uid_t pw_uid; /* user id */ gid_t pw_gid; /* group id */ char *pw_gecos; /* real name */ char *pw_dir; /* home directory */ char *pw_shell; /* shell program */ }; RETURN VALUE
The getpw() function returns 0 on success, or -1 if an error occurs. ERRORS
ENOMEM Insufficient memory to allocate passwd structure. FILES
/etc/passwd password database file CONFORMING TO
SYSVr2. BUGS
The getpw() function is dangerous as it may overflow the provided buffer buf. It is obsoleted by getpwuid(). SEE ALSO
fgetpwent(3), getpwent(3), setpwent(3), endpwent(3), getpwnam(3), getpwuid(3), putpwent(3), passwd(5) GNU
1996-05-27 GETPW(3)
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