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Top Forums UNIX for Beginners Questions & Answers Substitute particular char in a file Post 302992911 by kshari8888 on Friday 3rd of March 2017 11:56:29 AM
Old 03-03-2017
substitution of particular char

Thanks.
But the file is big one having 5000 records. I want to change only 154 th
char where the file is having 306 chars.
 

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queue-repair(8) 					      System Manager's Manual						   queue-repair(8)

NAME
queue-repair - deal with the qmail queue directory structure SYNOPSIS
queue-repair [ -htrcbn ] [ -n split ] [ conf-qmail ] DESCRIPTION
queue-repair deals with the qmail queue structure; it can create a new queue, move and properly rename a queue, dynamically change the conf-split value, convert big-todo queues to non-big-todo and vice versa, and repair a corrupted queue. conf-qmail defaults to /var/lib/qmail/ on Debian. OPTIONS
-h|--help Display usage information and built-in defaults, then exit. -t|--test Run in test-only mode. queue-repair will attempt to report all problems that it finds, without correcting them. This is the default. -r|--repair Run in repair mode. queue-repair will attempt to correct all problems that it finds, except if the basic queue directories (queue, queue/mess, queue/info, etc) are not found. -c|--create Run in create-and-repair mode. queue-repair will attempt to correct all problems that it finds, including creation of a new queue structure from scratch. -s|--split split Specify split as the value of conf-split. This is the number of split subdirectories for those queue directories which are hashed. The default for qmail is 23. Appropriate values depend on the volume of mail handled, OS filesystem efficiency, and other factors, but this should always be a prime number. If you do not specify conf-split, queue-repair will attempt to determine the current value from the existing queue. This option can be used, however, to change the conf-split value of an existing queue (qmail will still have to be recompiled with the new value). When creating a new queue, this option must always be specified. -b|--bigtoto Use big-todo. queue-repair should be able to automatically determine if you're using qmail patched with the big-todo patch. This option can be used, however, to convert a non-big-todo queue to a big-todo queue (qmail will still have to be recompiled with the big-todo patch). If neither this option nor --no-bigtodo is used, queue-repair will attempt to determine this automatically. When creating a new queue, either this option or --no-bigtodo must always be specified. -n|--no-bigtodo Do not use big-todo. queue-repair should be able to automatically determine if you're using qmail patched with the big-todo patch. This option can be used, however, to convert a big-todo queue to a non big-todo queue (qmail will still have to be recompiled with- out the big-todo patch). If neither this option nor --bigtodo is used, queue-repair will attempt to determine this automatically. When creating a new queue, either this option or --bigtodo must always be specified. --i-want-a-broken-conf-split Force the use of a non-prime value for conf-split. SEE ALSO
qmail(7) queue-repair(8)
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