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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.
find makes it easier, filtering . and ..
maxdepth could be removed, finding entries recursively. Removing mindepth causes . to appear
alternatively, run the spinner for 5 seconds:
timeout 5 bash -c 'spinner=( Ooooo oOooo ooOoo oooOo ooooO oooOo ooOoo oOooo); while true; do for i in ${spinner[@]}; do for j in seq 0 ${#i}; do echo -en "\b\b"; done; echo -ne "${i}"; sleep 0.2; done; done'
% cat ph-vmstat.awk
# Return human readable numbers
function hrnum(a) {
b = a ;
if (a > 1000000) { b = sprintf("%2.2fM", a/1000000) ; }
else if (a > 1000) { b = sprintf("%2.2fK", a/1000) ; }
return(b) ;
}
# Return human readable storage
function hrstorage(a) {
b = a ;
if (a > 1024000) { b = sprintf("%2.2fG", a/1024/1024) ; }
else if (a > 1024) { b = sprintf("%2.2fM", a/1024) ; }
return(b) ;
}
OFS=" " ;
$1 !~ /[0-9].*/ {print}
$1 ~ /[0-9].*/ {
$4 = hrstorage($4) ;
$5 = hrstorage($5) ;
$9 = hrnum($9) ;
$10 = hrnum($10) ;
$17 = hrnum($17) ;
$18 = hrnum($18) ;
$19 = hrnum($19) ;
print ;
}
The original suggestion did not work for me, when operating on folders located on an external mount (ie other than the root device) in Ubuntu. A variation using xargs does the trick.
pauses exactly long enough to wake at the top of the hour
Scans local area for visible Bluetooth devices. Use 'hcitool inq' to discover the type of device it is. And use -i hciX option to specify the local Bluetooth device to use.
Usage: upto directory
Download google video with wget. Or, if you wish, pass video URL to ie mplayer to view as stream.
1. VURL: replace with url. I.e. http://video.google.com/videoplay?docid=12312312312312313#
2. OUPUT_FILE : optionally change to a more suited name. This is the downloaded file. I.e. foo.flv
# Improvements greatly appreciated. (close to my first linux command after ls -A :) )
Breakedown pipe by pipe:
1. wget: html from google, pass to stdout
2. grep: get the video url until thumbnailUrl (not needed)
3. grep: Strip off everything before http://
4. sed: urldecode
5. echo: hex escapes
6. sed: stipr of tailing before thumbnailUrl
7. wget: download. Here one could use i.e. mplayer or other...
