#!/bin/bash
# renicename - Renices the job that matches the specified name.

setglobal user = ''""; setglobal tty = ''""; setglobal showpid = '0'; setglobal niceval = '"+1'"        # initialize

while getopts "n:u:t:p" opt {
  match $opt {
   with n  setglobal niceval = $OPTARG;               
   with u  if test ! -z $tty  {
         echo "$0: error: -u and -t are mutually exclusive." > !2
         exit 1
       }
       setglobal user = $OPTARG                     
   with t  if test ! -z $user  {
         echo "$0: error: -u and -t are mutually exclusive." > !2
         exit 1
       }
       setglobal tty = $OPTARG                      
   with p  setglobal showpid = '1';                       
   with ?  echo "Usage: $0 [-n niceval] [-u user|-t tty] [-p] pattern" > !2
       echo "Default niceval change is \"$niceval\" (plus is lower" > !2 
       echo "priority, minus is higher, but only root can go below 0)" > !2
       exit 1
  }
}
shift $shExpr('$OPTIND - 1')  # eat all the parsed arguments

if test $Argc -eq 0  {
  echo "Usage: $0 [-n niceval] [-u user|-t tty] [-p] pattern" > !2
  exit 1
}

if test ! -z $tty  {
  setglobal pid = $[ps cu -t $tty | awk "/ $1/ { print \\$2 }]
} elif test ! -z $user  {
  setglobal pid = $[ps cu -U $user | awk "/ $1/ { print \\$2 }]
} else {
  setglobal pid = $[ps cu -U $(USER:-LOGNAME) | awk "/ $1/ { print \$2 }]
}

if test -z $pid  {
  echo "$0: no processes match pattern $1" > !2 ; exit 1
} elif test ! -z $[echo $pid | grep ' ]  {
  echo "$0: more than one process matches pattern $(1):" 
  if test ! -z $tty  {
    setglobal runme = ""ps cu -t $tty""
  } elif test ! -z $user  {
    setglobal runme = ""ps cu -U $user""
  } else {
    setglobal runme = ""ps cu -U $(USER:-LOGNAME)""
  }
  eval $runme | \
      awk "/ $1/ { printf \"  user %-8.8s  pid %-6.6s  job %s\n\", \
      \$1,\$2,\$11 }"
  echo "Use -u user or -t tty to narrow down your selection criteria."
} elif test $showpid -eq 1  {
  echo $pid
} else {
  # ready to go: let's do it!
  /bin/echo -n "Renicing job \""
  /bin/echo -n $[ps cp $pid | sed 's/ [ ]*/ /g' | tail -1 |  cut -d' ' -f6-]
  echo "\" ($pid)"
  renice $niceval $pid
}

exit 0