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Commands tagged debug

Commands tagged debug from sorted by
Terminal - Commands tagged debug - 14 results
set -x && PS4='+\t '
2012-07-19 11:13:47
User: em
Functions: set
Tags: bash debug set xtrace profiling
0
Up
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Tracing shell scripts with time stamps

Enable tracing and print a timestamp before the command to be invoked.

Original author: Peter Eisentraut

http://petereisentraut.blogspot.com/2012/07/tracing-shell-scripts-with-time-stamps.html

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ssh -v jsmith@remotehost.example.com
2012-06-26 16:11:35
User: ankush108
Functions: ssh
Tags: ssh debug
0
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SSH with debug to troubleshoot any connection issues

Sometimes it is necessary to view debug messages to troubleshoot any

SSH connection issues. pass -v (lowercase v) option to the ssh as shown

below to view the ssh debug messages.

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while read ; do python <script> ; done
2012-02-23 22:29:09
User: Zulu
Functions: python read
Tags: read script while debug testing
-3
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Quickly re-launch your script (python for example)

Very useful for test a script. After launch this command, you only have to press ENTER for launch your script again. I work with screen and tape ENTER instead of '!!'+ENTER

If you break your script with CTRL-C, it will wait for press ENTER and will re-launch

You can write like it : while read -p "Press ENTER" ; do python ; done

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pidof httpd | sed 's/ / -p /g' | xargs strace -fp
2011-06-28 09:53:19
User: daniele
Functions: pidof sed strace xargs
Tags: debug apache strace
0
Up
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See what apache is doing without restarting it in debug mode
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ssh -R 9000:localhost:9000 you@remote-php-web-server.com
2011-05-28 09:39:16
User: nadavkav
Functions: ssh
Tags: ssh remote debug PHP xdebug
1
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Debug a remote php application (behind firewall) using ssh tunnel for XDEBUG port 9000

If you need to xdebug a remote php application, which is behind a firewall, and you have an ssh daemon running on that machine. you can redirect port 9000 on that machine over to your local machine from which you run your xdebug client (I am using phpStorm)

So, run this command on your local machine and start your local xdebug client, to start debugging.

more info:

http://code.google.com/p/spectator/wiki/Installing

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set -x
2010-12-15 09:17:04
User: depesz
Functions: set
Tags: bash debug
0
Up
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print line and execute it in BASH
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alias sshv='ssh -vvv -o LogLevel=DEBUG3'
2010-10-30 11:23:52
User: AskApache
Functions: alias
Tags: ssh bash alias log Encryption debug tty askapache SSH_TTY logging loglevel
2
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Debug SSH at the Maximum Verbosity Level

When debugging an ssh connection either to optimize your settings ie compression, ciphers, or more commonly for debugging an issue connecting, this alias comes in real handy as it's not easy to remember the '-o LogLevel=DEBUG3' argument, which adds a boost of debugging info not available with -vvv alone.

Especially useful are the FD info, and the setup negotiation to create a cleaner, faster connection.

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strace php tias.php -e open,access 2>&1 | grep foo.txt
2010-04-20 19:42:42
User: rkulla
Functions: grep strace
Tags: permissions debug strace errors
7
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See why a program can't seem to access a file

Sometimes a program refuses to read a file and you're not sure why. You may have display_errors turned off for PHP or something. In this example, fopen('/var/www/test/foo.txt') was called but doesn't have read access to foo.txt.

Strace can tell you what went wrong. E.g., if php doesn't have read access to the file, strace will say "EACCESS (Permission denied)". Or, if the file path you gave doesn't exist, strace will say "ENOENT (No such file or directory)", etc.

This works for any program you can run from the command-line, e.g., strace python myapp.py -e open,access...

Note: the above command uses php-cli, not mod_php, which is a different SAPI with diff configs, etc.

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xv() { case $- in *[xv]*) set +xv;; *) set -xv ;; esac }
2010-02-14 20:57:29
User: cfajohnson
Functions: set
Tags: bash debug tput ulimit askapache terminfo termcap set verbose xtrace
4
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Turn shell tracing and verbosity (set -xv) on/off with 1 command!

Turn shell tracing and verbosity (set -xv) on/off in any Bourne-type shell

If either -x or -v is set, the function turns them both off.

If neither is on, both are turned on.

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function setx(){ sed '/[xv]/!Q2' <<< $- && { set +xv; export PS4=">>> "; } || { export PS4="`tput setaf 3`>>> `tput sgr0`"; set -xv; }; }
2010-02-14 01:25:44
User: AskApache
Functions: export sed set
Tags: bash debug tput ulimit askapache terminfo termcap set verbose xtrace
0
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Turn shell tracing and verbosity (set -xv) on/off with 1 command!

Running this command turns shell tracing and shell verbose debugging on or off. Not only does it do that, it also uses your terminals builtin method of setting colors to make debugging much easier.

It looks at the current shell options contained in the $- special bash variable and that lets this function set the opposite of the current value. So from the shell you could do a:

setx; echo "y" | ( cat -t ) | echo "d"; setx

and it will turn on debbuggin.

This is an amazingly useful function that is perfect to add system-wide by adding it to /etc/profile or /etc/bashrc.. You can run it from the shell, and you can also use it in your shell scripts like my .bash_profile - http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

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env PS4=' ${BASH_SOURCE}:${LINENO}(${FUNCNAME[0]}) ' sh -x /etc/profile
2009-10-07 14:44:59
User: oernii2
Functions: env sh
Tags: bash debug oernii
16
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More precise BASH debugging
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socat -v tcp4-l:<port> tcp4:<host>:<port>
2009-09-25 17:10:16
User: sitaram
Tags: Linux debug socat
5
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Create a single-use TCP proxy with debug output to stderr

or you can add "-x" to get a typical hexdump like output

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gate() { mkfifo /tmp/sock1 /tmp/sock2 &> /dev/null && nc -p $1 -l < /tmp/sock1 | tee /tmp/sock2 & PID=$! && nc $2 $3 < /tmp/sock2 | tee /tmp/sock1; kill -KILL $PID; rm -f /tmp/sock1 /tmp/sock2 ; }
2009-09-25 08:10:23
User: true
Functions: kill mkfifo rm tee
Tags: Linux netcat debug
1
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Create a single-use TCP proxy with copy to stdout

USAGE: gate listening_port host port

Creates listening socket and connects to remote device at host:port. It uses pipes for connection between two sockets. Traffic which goes through pipes is wrote to stdout. I use it for debug network scripts.

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(acroread &);sleep 2;gdb /opt/Adobe/Reader8/Reader/intellinux/bin/acroread `pidof ld-linux.so.2`
2009-04-29 16:23:48
User: rhythmx
Tags: pdf gdb adobe debug
0
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One liner gdb attach to Acrobat
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