Bash的:

# This will trap any errors or commands with non-zero exit status
# by calling function catch_errors()
trap catch_errors ERR;

#
# ... the rest of the script goes here
#

function catch_errors() {
   # Do whatever on errors
   #
   #
   echo "script aborted, because of errors";
   exit 0;
}

[ $? -eq 0 ] || exit $?; # Exit for nonzero return code

#
#------------------------------------------------------------------------------
# purpose: to run a command, log cmd output, exit on error
# usage:
# set -e; do_run_cmd_or_exit "$cmd" ; set +e
#------------------------------------------------------------------------------
do_run_cmd_or_exit(){
    cmd="$@" ;

    do_log "DEBUG running cmd or exit: \"$cmd\""
    msg=$($cmd 2>&1)
    export exit_code=$?

    # If occurred during the execution, exit with error
    error_msg="Failed to run the command:
        \"$cmd\" with the output:
        \"$msg\" !!!"

    if [ $exit_code -ne 0 ] ; then
        do_log "ERROR $msg"
        do_log "FATAL $msg"
        do_exit "$exit_code" "$error_msg"
    else
        # If no errors occurred, just log the message
        do_log "DEBUG : cmdoutput : \"$msg\""
    fi

}

Bash的:

# This will trap any errors or commands with non-zero exit status
# by calling function catch_errors()
trap catch_errors ERR;

#
# ... the rest of the script goes here
#

function catch_errors() {
   # Do whatever on errors
   #
   #
   echo "script aborted, because of errors";
   exit 0;
}

在Bash中，这很简单。用&&把它们连在一起:

command1 && command2 && command3

你也可以使用嵌套的if结构:

if command1
   then
       if command2
           then
               do_something
           else
               exit
       fi
   else
       exit
fi

http://cfaj.freeshell.org/shell/cus-faq-2.html#11

How do I get the exit code of cmd1 in cmd1|cmd2 First, note that cmd1 exit code could be non-zero and still don't mean an error. This happens for instance in cmd | head -1 You might observe a 141 (or 269 with ksh93) exit status of cmd1, but it's because cmd was interrupted by a SIGPIPE signal when head -1 terminated after having read one line. To know the exit status of the elements of a pipeline cmd1 | cmd2 | cmd3 a. with Z shell (zsh): The exit codes are provided in the pipestatus special array. cmd1 exit code is in $pipestatus[1], cmd3 exit code in $pipestatus[3], so that $? is always the same as $pipestatus[-1]. b. with Bash: The exit codes are provided in the PIPESTATUS special array. cmd1 exit code is in ${PIPESTATUS[0]}, cmd3 exit code in ${PIPESTATUS[2]}, so that $? is always the same as ${PIPESTATUS: -1}. ... For more details see Z shell.