Take the 2-minute tour ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Anyone got a idea how to install the trace command on RHEL5 to monitor variable access? I already googled it and search via yum but nothing seems to work.

share|improve this question

2 Answers 2

up vote -1 down vote accepted

The command you link to is a built in TCL command. Do you have TCL installed?

yum install tcl

Edit: Try the following program:

  proc tellme {id a e op} {
    puts "  $id a=$a e=$e op=$op\
                ax=[info exists ::$a] ex=[info exists ::${a}($e)]"
  }

  proc do {args} {
    puts "<$args>"
    uplevel $args
  }

  trace var a wu {tellme array}
  trace var a(1) wu {tellme element}

  puts [trace vinfo a]
  puts [trace vinfo a(1)]

  do set a(0) zero
  do set a(1) one
  do set a(2) two
  do unset a(0)
  do unset a(2)
  do unset a

  # output is:
  #
  #   {wu {tellme array}}
  #   {wu {tellme element}}
  #   <set a(0) zero>
  #     array a=a e=0 op=w ax=1 ex=1
  #   <set a(1) one>
  #     array a=a e=1 op=w ax=1 ex=1
  #     element a=a e=1 op=w ax=1 ex=1
  #   <set a(2) two>
  #     array a=a e=2 op=w ax=1 ex=1
  #   <unset a(0)>
  #     array a=a e=0 op=u ax=1 ex=0
  #   <unset a(2)>
  #     array a=a e=2 op=u ax=1 ex=0
  #   <unset a>
  #     array a=a e= op=u ax=0 ex=0
  #     element a=a e=1 op=u ax=0 ex=0

(From http://wiki.tcl.tk/1505 )

share|improve this answer
    
yes, installed it, but it didn't include the trace command for an unknown reason. –  Henrik P. Hessel Mar 14 '10 at 13:14

You may be getting your UNIXes mixed up ... on Linux the command strace performs a system trace - that may be what you're looking for. Try a yum install strace

Alternatively you may be looking for traceroute to perform a network trace. Install that with a yum install traceroute

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.