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Full Discussion: line 5: [: -gt: unary operator expected
Top Forums Shell Programming and Scripting line 5: [: -gt: unary operator expected Post 302367475 by methyl on Monday 2nd of November 2009 07:16:04 PM
Old 11-02-2009
As other posters imply, what is the response to typing this command at the same place where you might execute the script? The error message implies that the response is not a number.
Quote:
awk 'END {print NR}' ecoli_operons
Knowing the Operating System and version would help.
Clutching at straws and if the above command does not give an error message.
1) The environment variable $LINES is reserved in all modern shells. Though I have no factual reason to suggest this, you could try another name for the variable $lines.
2) A script edited on a MSDOS and ported to unix without proper text file conversion could misbehave like this.
3) The trailing semi-colon on "while [ $lines -gt 0 ];" is surplus.
4) How big is the file? Is $lines a very large number (> 2x1024x1024x1024) ?
Last edited by methyl; 11-02-2009 at 08:50 PM..
 

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LEARN ABOUT CENTOS

scsi_readcap

SCSI_READCAP(8) 						     SG3_UTILS							   SCSI_READCAP(8)

NAME

       scsi_readcap - do SCSI READ CAPACITY command on disks

SYNOPSIS

       scsi_readcap [--brief] [--help] [--long] [--verbose] DEVICE [DEVICE]*

DESCRIPTION

       This bash shell script calls the sg_readcap utility on each given DEVICE. This will send a SCSI READ CAPACITY command to each DEVICE.

       The  default  action of this script is to send the 10 byte cdb READ CAPACITY(10) command to each DEVICE. If a response indicates the number
       of blocks is greater than or equal to '2**32 - 1' then the READ CAPACITY(16) is sent and its response is output.

OPTIONS

       Arguments to long options are mandatory for short options as well.

       -b, --brief
	      shortens the output to two hexadecimal numbers, both prefixed by '0x'.  The first number is the number of blocks available  and  the
	      second  is  the  size  of each blocks in bytes (e.g. '0x12a19eb0 0x200'). If an error is detected '0x0 0x0' is output and the script
	      continues if there are more DEVICEs.

       -h, --help
	      print out the usage message then exit.

       -l, --long
	      the default is to send the READ CAPACITY(10) command (i.e. the 10 byte cdb variant). When this option is given the READ CAPACITY(16)
	      command is sent. The latter command yields more information in its response.

       -v, --verbose
	      increase level or verbosity.

EXIT STATUS

       The exit status of this script is 0 when it is successful. Otherwise the exit status is that of the last sg_readcap utility called. See the
       sg3_utils(8) man page.

AUTHORS

       Written by D. Gilbert

COPYRIGHT

       Copyright (C) 2009-2013 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A  PARTICULAR  PUR-
       POSE.

SEE ALSO

       sg_readcap (sg3_utils)

sg3_utils-1.36							     May 2013							   SCSI_READCAP(8)
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