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Full Discussion: Command works at command line but not from cron
Top Forums Shell Programming and Scripting Command works at command line but not from cron Post 303035634 by edstevens on Wednesday 29th of May 2019 02:58:13 PM
Old 05-29-2019
Command works at command line but not from cron
Oracle Linux 6.
Trying to set up a simple monitoring of memory usage. This command does exactly what I want at the command line:

Code:
echo $(date +%Y-%m-%d" "%H:%M:%S) $(grep PageTables /proc/meminfo) >> /home/oracle/meminfo.log

But when I put it in my crontab:

Code:
* * * * *  echo $(date +%Y-%m-%d" "%H:%M:%S) $(grep PageTables /proc/meminfo) >> /home/oracle/meminfo.log

It fails and I get this in my mail

Code:
/bin/sh: -c: line 0: unexpected EOF while looking for matching `)'
/bin/sh: -c: line 1: syntax error: unexpected end of file

 

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LEARN ABOUT CENTOS

free

FREE(1) 							   User Commands							   FREE(1)

NAME

       free - Display amount of free and used memory in the system

SYNOPSIS

       free [options]

DESCRIPTION

       free  displays the total amount of free and used physical and swap memory in the system, as well as the buffers and caches used by the ker-
       nel. The information is gathered by parsing /proc/meminfo. The displayed columns are:

       total  Total installed memory (MemTotal and SwapTotal in /proc/meminfo)

       used   Used memory (calculated as total - free)

       free   Unused memory (MemFree and SwapFree in /proc/meminfo)

       shared Memory used (mostly) by tmpfs (Shmem in /proc/meminfo, available on kernels 2.6.32, displayed as zero if not available)

       buffers
	      Memory used by kernel buffers (Buffers in /proc/meminfo)

       cached Memory used by the page cache  (calculated as Cached - Shmem in /proc/meminfo - the Cached value is actually the sum of  page  cache
	      and tmpfs memory)

OPTIONS

       -b, --bytes
	      Display the amount of memory in bytes.

       -k, --kilo
	      Display the amount of memory in kilobytes.  This is the default.

       -m, --mega
	      Display the amount of memory in megabytes.

       -g, --giga
	      Display the amount of memory in gigabytes.

       --tera Display the amount of memory in terabytes.

       -h, --human
	      Show  all  output  fields automatically scaled to shortest three digit unit and display the units of print out.  Following units are
	      used.

		B = bytes
		K = kilos
		M = megas
		G = gigas
		T = teras

	      If unit is missing, and you have petabyte of RAM or swap, the number is in terabytes and columns might not be aligned with header.

       -c, --count count
	      Display the result count times.  Requires the -s option.

       -l, --lohi
	      Show detailed low and high memory statistics.

       -o, --old
	      Display the output in old format, the only difference being this option will disable the display of the "buffer adjusted" line.

       -s, --seconds seconds
	      Continuously display the result delay seconds apart.  You may actually specify any floating point number	for  delay,  usleep(3)	is
	      used for microsecond resolution delay times.

       --si   Use power of 1000 not 1024.

       -t, --total
	      Display a line showing the column totals.

       --help Print help.

       -V, --version
	      Display version information.

FILES

       /proc/meminfo
	      memory information

SEE ALSO

       ps(1), slabtop(1), top(1), vmstat(8).

AUTHORS

       Written by Brian Edmonds.

REPORTING BUGS

       Please send bug reports to <procps@freelists.org>

procps-ng							  September 2011							   FREE(1)
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