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Top Forums Shell Programming and Scripting I/O Redirection: how can I redirect error msgs to a temp file Post 302485908 by Abdulelah on Thursday 6th of January 2011 02:41:32 PM
Old 01-06-2011
thanks for your help and input guys,

what I need is to give the nslookup an IP address each time using a while loop (done)

and than, check if a host name was returned.. if it does then great! and it will be added to a temporary file. if it is not, than I want a customized error msg to appear.

what I am doing now is taking only the host name part of the nslookup output.. which can has something like "ns9.google.com" or sometimes.. nothing!

I want to replace the "nothing" with an error msg that I wrote.

---------- Post updated at 06:21 PM ---------- Previous update was at 05:25 PM ----------

here is the part I am trying to do that through:

Quote:
awk ' {if ( ! -s (print $2)) then "you've got an error pal!" else '{print $2}' fi}'
what I'm trying to achieve here is that, when ever that value of print $2 is null, than print an error mssage, otherwise print the value in print $2

this should make things clearer to you I wish

---------- Post updated at 07:41 PM ---------- Previous update was at 06:21 PM ----------

this code seems to be partially working:

Quote:
awk '{if ( ! -n $4) { print $4 } else { print "Error"}}
but I am getting no "Error" messages. any suggestions please.

Last edited by Abdulelah; 01-06-2011 at 02:44 PM..
 

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MHPATH(1)							     [nmh-1.5]								 MHPATH(1)

NAME
mhpath - print full pathnames of nmh messages and folders SYNOPSIS
mhpath [+folder] [msgs] [-version] [-help] DESCRIPTION
mhpath expands and sorts the message list `msgs' and writes the full pathnames of the messages to the standard output separated by new- lines. If no `msgs' are specified, mhpath outputs the current mail folder's pathname instead. If the only argument is `+', your nmh "Path" is output; this can be useful in shell scripts. Contrasted with other nmh commands, a message argument to mhpath may often be intended for writing. Because of this: 1) the name "new" has been added to mhpath's list of reserved message names (the others are "first", "last", "prev", "next", "cur", and "all"). The new message is equivalent to the message after the last message in a folder (and equivalent to 1 in a folder without mes- sages). The "new" message may not be used as part of a message range. 2) Within a message list, the following designations may refer to messages that do not exist: a single numeric message name, the single message name "cur", and (obviously) the single message name "new". All other message designations must refer to at least one existing message, if the folder contains messages. 3) An empty folder is not in itself an error. A message number less than that of the smallest existing message in a folder is treated as if the message already exists. A message number greater than that of the highest existing message in a folder causes an "out of range" error message to be displayed. As part of a range designation that contains messages that do exist, message numbers less than the smallest, or greater than the highest, existing message in a folder are ignored. Examples: The current folder foo contains messages 3 5 6. Cur is 4. % mhpath /r/phyl/Mail/foo % mhpath all /r/phyl/Mail/foo/3 /r/phyl/Mail/foo/5 /r/phyl/Mail/foo/6 % mhpath 2001 mhpath: message 2001 out of range 1-6 % mhpath 1-2001 /r/phyl/Mail/foo/3 /r/phyl/Mail/foo/5 /r/phyl/Mail/foo/6 % mhpath new /r/phyl/Mail/foo/7 % mhpath last new /r/phyl/Mail/foo/6 /r/phyl/Mail/foo/7 % mhpath last-new mhpath: bad message list last-new % mhpath cur /r/phyl/Mail/foo/4 % mhpath 1-2 mhpath: no messages in range 1-2 % mhpath first:2 /r/phyl/Mail/foo/3 /r/phyl/Mail/foo/5 % mhpath 1 2 /r/phyl/Mail/foo/1 /r/phyl/Mail/foo/2 mhpath is also useful in back-quoted operations: % cd `mhpath +inbox` % echo `mhpath +` /r/phyl/Mail FILES
$HOME/.mh_profile The user profile PROFILE COMPONENTS
Path: To determine the user's nmh directory Current-Folder: To find the default current folder SEE ALSO
folder(1) DEFAULTS
`+folder' defaults to the current folder `msgs' defaults to none CONTEXT
None BUGS
Like all nmh commands, mhpath expands and sorts [msgs]. So don't expect mv `mhpath 501 500` to move 501 to 500. Quite the reverse. But mv `mhpath 501` `mhpath 500` will do the trick. Out of range message 0 is treated far more severely than large out of range message numbers. MH.6.8 11 June 2012 MHPATH(1)
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