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Full Discussion: bash logging al $() command lines
Top Forums Shell Programming and Scripting bash logging al $() command lines Post 302580787 by DGPickett on Friday 9th of December 2011 03:11:26 PM
Old 12-09-2011
I was testing how the restart of daemons reacted to a shortage of mysql connections, so I drop the limit, kill a daemon, wait for new messages, then raise the limit, wait for the message count to quiesce and move to the next daemon. It works fine except for the bash blowing out junk from $() onto the console. I guess I am singularly cursed.

Maybe it comes from the ENV?
Code:
$ set
BASH=/bin/bash
BASH_ARGC=()
BASH_ARGV=()
BASH_LINENO=()
BASH_SOURCE=()
BASH_VERSINFO=([0]="3" [1]="00" [2]="15" [3]="1" [4]="release" [5]="x86_64-redhat-linux-gnu")
BASH_VERSION='3.00.15(1)-release'
COLORS=/etc/DIR_COLORS.xterm
COLUMNS=81
CYCLOPS_HOME=/var/xxx/6_1_22_rc4
DIRSTACK=()
EDITOR=vim
EUID=10103
GROUPS=()
G_BROKEN_FILENAMES=1
HISTFILE=/var/xxx/.bash_history
HISTFILESIZE=1000000
HISTSIZE=1000000
HOME=/var/xxx
HOSTNAME=xxx.yyy.zzz
HOSTTYPE=x86_64
IFS=$' \t\n'
INPUTRC=/etc/inputrc
LANG=en_US.UTF-8
LESSOPEN='|/usr/bin/lesspipe.sh %s'
LINES=25
LOGNAME=xxx
LS_COLORS='no=00:fi=00:di=00;34:ln=00;36:pi=40;33:so=00;35:bd=40;33;01:cd=40;33;01:or=01;05;37;41:mi=01;05;37;41:ex=00;32:*.cmd=00;32:*.exe=00;32:*.com=00;32:*.btm=00;32:*.bat=00;32:*.sh=00;32:*.csh=00;32:*.tar=00;31:*.tgz=00;31:*.arj=00;31:*.taz=00;31:*.lzh=00;31:*.zip=00;31:*.z=00;31:*.Z=00;31:*.gz=00;31:*.bz2=00;31:*.bz=00;31:*.tz=00;31:*.rpm=00;31:*.cpio=00;31:*.jpg=00;35:*.gif=00;35:*.bmp=00;35:*.xbm=00;35:*.xpm=00;35:*.png=00;35:*.tif=00;35:'
MACHTYPE=x86_64-redhat-linux-gnu
MAIL=/var/spool/mail/c64adm
MAILCHECK=60
OLDPWD=/var/c64adm
OPTERR=1
OPTIND=1
OSTYPE=linux-gnu
PATH=/home2/xxx/6_1_22_rc4/test-local/bin:/home2/xxx/6_1_22_rc4/mon-local/bin:/home2/xxx/6_1_22_rc4/host-local/bin:/home2/xxx/6_1_22_rc4/local/bin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/home2/xxx/bin:/sbin:/usr/sbin:/home/yyy/bin
PIPESTATUS=([0]="0")
PPID=19816
PS1='\[\e]0;\u@\h: \w\a\]\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
PS2='> '
PS4='+ '
PWD=/var/xxx/6_1_22_rc4
SHELL=/bin/bash
SHELLOPTS=braceexpand:hashall:histexpand:history:interactive-comments:monitor:vi
SHLVL=1
SSH_CLIENT='::ffff:192.168.9.73 46673 22'
SSH_CONNECTION='::ffff:192.168.9.73 46673 ::ffff:192.168.9.109 22'
SSH_TTY=/dev/pts/0
SUPPORTED=en_US.UTF-8:en_US:en
TERM=xterm
UID=10103
USER=xxx
_=--no-diag-kern
f=local/bin/cyclops64-linux-elf-sim
i=host-local/var/log/swras-master.log

I never heard of the input generating shell caring that it was feeding mysql. I suspect the messages are on stderr or tty, since they cannot pipe through mysql! It is a very obnoxious thing for a shell to do. Maybe I have to take it to bash-dev-land.
 

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LEARN ABOUT REDHAT

initscript

INITSCRIPT(5)						Linux System Administrator's Manual					     INITSCRIPT(5)

NAME

       initscript - script that executes inittab commands.

SYNOPSIS

       /bin/sh /etc/initscript id runlevels action process

DESCRIPTION

       When  the  shell  script /etc/initscript is present, init will use it to execute the commands from inittab.  This script can be used to set
       things like ulimit and umask default values for every process.

EXAMPLES

       This is a sample initscript, which might be installed on your system as /etc/initscript.sample.

	      #
	      # initscript   Executed by init(8) for every program it
	      # 	     wants to spawn like this:
	      #
	      # 	     /bin/sh /etc/initscript <id> <level> <action> <process>
	      #

		# Set umask to safe level, and enable core dumps.
		umask 022
		ulimit -c 2097151
		PATH=/bin:/sbin:/usr/bin:/usr/sbin
		export PATH

		# Increase the hard filedescriptor limit for all processes
		# to 8192.  The soft limit is still 1024, but any unpriviliged
		# process can increase it's soft limit up to the hardlimit
		# with "ulimit -Sn xxx" (needs a 2.2.13 or later Linux kernel).
		ulimit -Hn 8192

		# Execute the program.
		eval exec "$4"

FILES

       /etc/inittab, /etc/initscript.

AUTHOR

       Miquel van Smoorenburg ,<miquels@cistron.nl>

SEE ALSO

       init(8), inittab(5).

								 December 24, 1999						     INITSCRIPT(5)
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