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Full Discussion: Ignore the 255 character limit of command line
Top Forums Shell Programming and Scripting Ignore the 255 character limit of command line Post 302574707 by agentgrecko on Friday 18th of November 2011 05:55:46 AM
Old 11-18-2011
Ignore the 255 character limit of command line
Hi

I would just like to ask if there is a way for UNIX to ignore/overcome the 255 character limit of the command line?

My problem is that I have a really long line of text from a file (300+ bytes) which i have to "echo" and process by adding commands like "sed" to the end of the line, like the following:

Code:
echo "xxx really long line of text xxx" | sed -e s/xxx/yyy/g

I have read in here that there are character limits (depends on system), and tested the system I'm using and indeed, it can only process commands not exceeding 255 chars. Have also read on changing the values of ARG_MAX (limits.h) but unfortunately, my access has no permission on changing those values.

Is there a way to overcome this limit without changing system parameters? Like setting a temp buffer for the string of text/commands?

Appreciate any feedback, thanks.
 

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LEARN ABOUT MOJAVE

warnquota.conf

WARNQUOTA.CONF(5)                                               File Formats Manual                                              WARNQUOTA.CONF(5)

NAME

       warnquota.conf - configuration for warnquota

SYNOPSIS

       /etc/warnquota.conf

DESCRIPTION

       The  warnquota.conf  file stores a configuration for warnquota(8) tool which is used to notify a user or a group who exceeds its disk quota
       limits.

       The syntax is an option name followed by an equal sign and the option value.  White space characters surrounding the option names and  val-
       ues are allowed.

       Empty lines or lines starting with a hash sign or a semicolon are ignored.

       An  option value can but does not have to be quoted. The value can span across multiple lines provided each previous line ends with a back-
       slash.

       Some option values can contain formatting sequences which will be expanded to their respective values. Following sequences are recognized:

       %d                  domain name
       %h                  host name
       %i, %s              user or group name
       %%                  literal % character
       |                   new-line character

OPTIONS

       CC_BEFORE           Send to copy-carbon address only when a user has less than specified grace time left. Value is a number followed  by  a
                           time unit. Known units are seconds, minutes, hours, and days.  Example: 5 days
       CC_TO               An e-mail address to put into copy-carbon (CC:) recipient header. Default value is root.
       CHARSET             Defines  character  set  for sent e-mails. Default value will be current locale character set used when executing warn-
                           quota command, if locale is not either C or POSIX.  Otherwise no character set will be specified in the e-mails.
       FROM                Defines From: e-email address. Default value is support@localhost.
       GROUP_MESSAGE       A text sent as an e-mail body if a group exceeds its limits. This option recognizes formatting sequences.
       GROUP_SIGNATURE     A signature text appended to notification for a group. Default value is a general  explanation  utilizing  SUPPORT  and
                           PHONE values. This option recognizes formatting sequences.
       LDAP_BASEDN         Base distinguished name for LDAP queries.
       LDAP_BINDDN         Bind distinguished name for LDAP queries.
       LDAP_BINDPW         Bind password for LDAP queries.
       LDAP_DEFAULT_MAIL_DOMAIN
                           Default e-mail address domain of searched user if given LDAP attribute does not specify any.
       LDAP_HOST           LDAP server name to connect to if LDAP_URI is not defined.
       LDAP_MAIL           A  boolean  controlling  if  LDAP  has to be used to look up user's e-mail address. Possible values are true and false.
                           Default value is false.
       LDAP_MAIL_ATTRIBUTE The LDAP attribute which holds user's e-mail address.
       LDAP_PORT           LDAP server port number to connect to if LDAP_URI is not defined.
       LDAP_SEARCH_ATTRIBUTE
                           The LDAP attribute which holds user's ID to look up.
       LDAP_URI            The URL of LDAP server to use to search user's e-mail addresses.  This  option  takes  preference  over  LDAP_HOST  and
                           LDAP_PORT.  Example: ldaps://example.com:389/
       MESSAGE             A beginning of text sent as an e-mail body if a user exceeds his limits. This option recognizes formatting sequences.
       MAIL_CMD            The  command to execute to send an e-mail. The e-mail text including all headers is passed to the standard input of the
                           command. Default value is /usr/lib/sendmail -t.
       MAILDEV             The device with disk quotas to exclude from sending notifications if there are  exceeded  limits.  This  option  should
                           identify the device where mail boxes are stored to prevent from bouncing the warnquota notification by local MDA due to
                           no space for storing new e-mails. Special value any denotes all devices.
       PHONE               The telephone contact to the user support. Default value is (xxx) xxx-xxxx or (yyy) yyy-yyyy.
       SIGNATURE           The end of e-mail body if a user exceeds its limits. Default value is a general explanation utilizing SUPPORT and PHONE
                           values. This option recognizes formatting sequences.
       SUBJECT             The text to put into Subject: header. Default value is Disk Quota usage on system.
       SUPPORT             The contact to the user support. Default value is support@localhost.
EXAMPLE

       # comment
       FROM = root@example.com
       SUPPORT = support@example.com
       PHONE = 1234
FILES

       /etc/warnquota.conf configuration for warnquota(8)

SEE ALSO

       warnquota(8).

                                                                                                                                 WARNQUOTA.CONF(5)
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