Check These Out
For when you want to flush all content from a file without removing it (hat-tip to Marc Kilgus).
Creates one letter folders in the current directory and moves files with corresponding initial in the folder.
Only filters the statement related to a specific table ('departments', in the example), from the output of mysqldump
% 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 ;
}
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"
this leaves the cursor at the bottom of the terminal screen, where your eyes are.
ctrl-l moves it to the top, forcing you to look up.
This command uses the debugger to attach to a running process, and reassign a filehandle to a file.
The two commands executed in gdb are
p close(1) which closes STDOUT
and
p creat("/tmp/filename",0600)
which creates a file and opens it for output. Since file handles are assigned
sequentially, this command opens the file in place of STDOUT and once the process continues, new output to STDOUT will instead be written to our capture file.
This version is precise and requires one second to collect statistics. Check sample output for a more generic version and also a remote computer invocation variant. It doesn't work with the busybox version of the 'top' command but can be adjusted