Check existence of a login Post: 302172095

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

check for FILES existence

hi, I have a list of filenames and I want to verify if they all exist. I know "if filename" would do the trick but how do I go about a list of files? thanks

2. UNIX for Dummies Questions & Answers

Variable check for existence ?

Hi , I have a script wherein i have a For Loop. Within this for loop i create a variable and assign it a value. The script goes to a For Loop only if certain conditions are met , which means the variable may or may not exists. However down the line in the script i have to check if that...

3. Programming

C function to test existence of a login

Hi everybody, I need to check in C program whether a given login is known on the system. Is there any system function that could do this ? So far, all I could find is getpwnam(), which answers my problem by parsing the local password database. But won't work if a user is authenticated by...

4. AIX

check for file existence

Hello I am having a requirement like if there is no file in the directory then i need a message to pop on after the execution of the script. My script basically does for File in `ls -t $DIRECTORY | tail -1`; if there is no file the DIRECTORY then the script is simply exiting with out...

5. AIX

Check for File Existence

I have requirement where i need to search for files which start with SALESORDER and PURCHASEORDER. i need to process the files with SALESORDER first and then PURCHASEORDER. If SALESORDER files are not there i dont want to process PURCHASEORDER and i want to come out of script. I have written a code...

6. Shell Programming and Scripting

check existence of the path

Hi How can I check if the path exist or not? echo "Enter path:"; read my_path; ##I should check whether my_path exists or not....

7. Shell Programming and Scripting

How to check for file existence?

i want to check if the file is in the directory or not, and also it should be handle error conditions, like missing files and report the error and exit. i did something like this: file ="hello" if !test -e "${file}" then echo "No such files exist!" exit 1 else do something....... fi ...

8. UNIX for Dummies Questions & Answers

To check for existence of a file

I need to check for the existence of a file *.log in a specific directory using a perl script. Presently am not in that particular directory. So i am using chdir ("/path/to/my/file) And then i am using the -e in an if statement to check if it exists. if (-e $File) {......} $File contains the...

9. Shell Programming and Scripting

Check the Files existence

Hi I have a requirement to check whether the files exists, then it will call other steps in shell script. I did ls *.csv|wc -l if then checking the count of the files should be more than 1 then it will call other steps. I am getting the error that too many arguements as there n...

10. Shell Programming and Scripting

File existence check

hi i wanted to check if the file exist or not(multiple files) DIRE=/home/V478 if ; then echo "file present" else echo "file not present" fi But i am getting the error as : [: unexpected operator/operand

LEARN ABOUT OPENDARWIN

su

SU(1)							    BSD General Commands Manual 						     SU(1)

NAME

     su -- substitute user identity

SYNOPSIS

     su [-flm] [login] [-c shell arguments]

DESCRIPTION

     su requests the password for login and switches to that user and group ID after obtaining proper authentication.  A shell is then executed,
     and any additional shell arguments after the login name are passed to the shell.  If su is executed by root, no password is requested and a
     shell with the appropriate user ID is executed.

     The options are as follows:

     -c      Invoke the following command in a subshell as the specified user.

     -f      If the invoked shell is csh(1), this option prevents it from reading the ``.cshrc'' file.

     -l      Simulate a full login.  The environment is discarded except for HOME, SHELL, PATH, TERM, and USER.  HOME and SHELL are modified as
	     above.  USER is set to the target login.  PATH is set to ``/bin:/usr/bin''.  TERM is imported from your current environment.  The
	     invoked shell is the target login's, and su will change directory to the target login's home directory.  This option is identical to
	     just passing "-", as in "su -".

     -m      Leave the environment unmodified.	The invoked shell is your login shell, and no directory changes are made.  As a security precau-
	     tion, if the target user's shell is a non-standard shell (as defined by getusershell(3)) and the caller's real uid is non-zero, su
	     will fail.

     The -l and -m options are mutually exclusive; the last one specified overrides any previous ones.

     Only users in group ``wheel'' (normally gid 0) or group ``admin'' (normally gid 20) can su to ``root''.

     By default (unless the prompt is reset by a startup file) the super-user prompt is set to ``#'' to remind one of its awesome power.

SEE ALSO

     csh(1), login(1), sh(1), skey(1), kinit(1), kerberos(1), passwd(5), group(5), environ(7)

ENVIRONMENT

     Environment variables used by su :

     HOME  Default home directory of real user ID unless modified as specified above.

     PATH  Default search path of real user ID unless modified as specified above.

     TERM  Provides terminal type which may be retained for the substituted user ID.

     USER  The user ID is always the effective ID (the target user ID) after an su unless the user ID is 0 (root).

HISTORY

     A su command appeared in Version 7 AT&T UNIX.

BSD
								  April 18, 1994							       BSD