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Full Discussion: Accepting A-Za-Z
Top Forums Shell Programming and Scripting Accepting A-Za-Z Post 302462624 by DGPickett on Thursday 14th of October 2010 04:02:43 PM
Old 10-14-2010
If you want to restrict the input, this might work, except sed will want an extra linefeed:

Code:
$(
 echo 'Enter Parameter: \c' >/dev/tty
 sed '
   /[^a-zA-Z0-9]/{
      s/.*/Must contain only letters and numbers: "&"/
      w /dev/tty
      d
     }
   q
  '
 )


This is a bit busier, but you see you can do almost anything in the $() to get the parameter. narrative: Capture the stdout of a subshell as a single parameter, set output_var blank, while output_var is blank, prompt for the parameter and read one line, saving it for error output. If the line is blank or has a forbidden character, it is rejected by displaying it including expansion of any control characters and looping back else echo it out of the subshell as the parameter:

Code:
$(
   l2=""
   while [ "$l2" = "" ]
   do
    echo 'Enter Parameter: \c' >/dev/tty
    line | read l
    echo "$l" | sed '/[^a-zA-Z0-9]/d' | read l2
    if [ "$l2" = "" ]
    then
     echo "Invalid, must be only numbers and letters and not empty: '$l'" | cat -vt >/dev/tty
    fi
   done

  echo "$l2"
 )

Add " | tr '[a-z] '[A-Z]' " or
" | sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' " for all caps -- there may be other more specific options and commands, but this general solution suffices and fits other needs, too. Since there is sed in the scripts above, it can be done at the end of the current sed script parameter.
Last edited by DGPickett; 10-15-2010 at 11:13 AM.. Reason: wrong sed capitalize command
 

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LEARN ABOUT CENTOS

sss_usermod

SSS_USERMOD(8)							 SSSD Manual pages						    SSS_USERMOD(8)

NAME

       sss_usermod - modify a user account

SYNOPSIS

       sss_usermod [options] LOGIN

DESCRIPTION

       sss_usermod modifies the account specified by LOGIN to reflect the changes that are specified on the command line.

OPTIONS

       -c,--gecos COMMENT
	   Any text string describing the user. Often used as the field for the user's full name.

       -h,--home HOME_DIR
	   The home directory of the user account.

       -s,--shell SHELL
	   The user's login shell.

       -a,--append-group GROUPS
	   Append this user to groups specified by the GROUPS parameter. The GROUPS parameter is a comma separated list of group names.

       -r,--remove-group GROUPS
	   Remove this user from groups specified by the GROUPS parameter.

       -l,--lock
	   Lock the user account. The user won't be able to log in.

       -u,--unlock
	   Unlock the user account.

       -Z,--selinux-user SELINUX_USER
	   The SELinux user for the user's login.

       -?,--help
	   Display help message and exit.

THE LOCAL DOMAIN

       In order to function correctly, a domain with "id_provider=local" must be created and the SSSD must be running.

       The administrator might want to use the SSSD local users instead of traditional UNIX users in cases where the group nesting (see
       sss_groupadd(8)) is needed. The local users are also useful for testing and development of the SSSD without having to deploy a full remote
       server. The sss_user* and sss_group* tools use a local LDB storage to store users and groups.

SEE ALSO

       sssd(8), sssd.conf(5), sssd-ldap(5), sssd-krb5(5), sssd-simple(5), sssd-ipa(5), sssd-ad(5), sssd-sudo(5),sss_cache(8), sss_debuglevel(8),
       sss_groupadd(8), sss_groupdel(8), sss_groupshow(8), sss_groupmod(8), sss_useradd(8), sss_userdel(8), sss_usermod(8), sss_obfuscate(8),
       sss_seed(8), sssd_krb5_locator_plugin(8), sss_ssh_authorizedkeys(8), sss_ssh_knownhostsproxy(8),pam_sss(8).

AUTHORS

       The SSSD upstream - http://fedorahosted.org/sssd

SSSD
								    06/17/2014							    SSS_USERMOD(8)
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