更多 shell 脚本技术
#!/usr/bin/bash ########################################################################## traps
#########################################################################
# trap when a user is attempting to leave the script
trap 'exit_msg 1 0 "Signal Caught. Exiting..."' HUP INT QUIT KILL ABRT
trap 'window_size_changed' WINCH # trap when a user has resized the window
#########################################################################
#########################################################################
# defined/exported variables
#########################################################################
_MSG_SLEEP_TIME=3 # seconds to sleep for all messages
# (if not defined, default will is 1 second)
_CUSTNUM_SIZE=6 # length of a customer number in this location
# (if not defined, default is 6)
_DEBUG_LEVEL=0 # log debug messages. log level is accumulative
# (i.e. 1 = 1, 2 = 1 & 2, 3 = 1, 2, & 3)
# (if not defined, default is 0)
# Log levels:
#0 = No messages
#1 = brief messages (start script, errors, etc)
#2 = environment setup (set / env)
#3 = set -x (A LOT of spam)
_TMPDIR="/tmp" # directory to put work/tmp files
# (if not defined, default is /tmp)
_SP_LOG="${0##*/}.log" # log of script events
_SP_REQUESTS="${HOME}/sp_requests"
# file to customer record requests,
# also read at startup
_MENU_ITEMS=15 # default number of items to display per page
# (it not defined, default is 10)
LESS="-P LINE\: %l" # format 'less' prompt. MAN less if more info
# export the variables defined above
export _MSG_SLEEP_TIME _CUSTNUM_SIZE _DEBUG_LEVEL _TMPDIR
_SP_LOG _SP_REQUESTS _MENU_ITEMS
#########################################################################
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