11-27-2008
String manipulation
I am doing some training for a job I have just got and there is an exercise I am stuck with. I am not posting to ask a question about logic, just a trivial help with string manipulation. I would appreciate if somebody could at least give me a hint on how to do it.
Basically, the intelligent part is all done.
All I have left to do is to replace the user name with the real name
user name: name.surname
real name has to be Name Surname.
I can't use AWK or SED. Any idea?
Thanks
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LEARN ABOUT REDHAT
setreuid
SETREUID(2) Linux Programmer's Manual SETREUID(2)
NAME
setreuid, setregid - set real and/or effective user or group ID
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
int setreuid(uid_t ruid, uid_t euid);
int setregid(gid_t rgid, gid_t egid);
DESCRIPTION
setreuid sets real and effective user IDs of the current process. Unprivileged users may only set the real user ID to the real user ID or
the effective user ID, and may only set the effective user ID to the real user ID, the effective user ID or the saved user ID.
Supplying a value of -1 for either the real or effective user ID forces the system to leave that ID unchanged.
If the real user ID is set or the effective user ID is set to a value not equal to the previous real user ID, the saved user ID will be set
to the new effective user ID.
Completely analogously, setregid sets real and effective group ID's of the current process, and all of the above holds with "group" instead
of "user".
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EPERM The current process is not the super-user and changes other than (i) swapping the effective user (group) ID with the real user
(group) ID, or (ii) setting one to the value of the other or (iii) setting the effective user (group) ID to the value of the saved
user (group) ID was specified.
NOTES
Setting the effective user (group) ID to the saved user ID is possible since Linux 1.1.37 (1.1.38).
CONFORMING TO
BSD 4.3 (the setreuid and setregid function calls first appeared in 4.2BSD).
SEE ALSO
getuid(2), getgid(2), setuid(2), setgid(2), seteuid(2), setresuid(2)
Linux 1.1.38 1994-08-02 SETREUID(2)