Monthly Archives: August 2013

commandline session $echo a > hex.txt $hexdump hex.txt 0000000 0a61 0000002 $ $echo b > hex.txt $hexdump hex.txt 0000000 0a62 0000002 $echo ab > hex.txt $ $hexdump hex.txt 0000000 6261 000a 0000003 $echo > hex.txt $hexdump hex.txt 0000000 000a 0000001 $echo abc > hex.txt $hexdump hex.txt 0000000 6261 0a63 0000004 $

root>free -l -s 3 total used free shared buffers cached Mem: 1995396 1832704 162692 0 246952 500216 Low: 1995396 1832704 162692 High: 0 0 0 -/+ buffers/cache: 1085536 909860 Swap: 5843964 7456 58310008 total used free shared buffers cached Mem: 1995396 1832616 162780 0 246952 500216 Low: 1995396 1832704 162692 High: 0 0 0 -/+ …

Continue reading “free – it displays buffers used by the kernel”

commandline session $> 1 $flock 1 $ls 1 $echo 1 > 1 $cat 1 1 $ls -l total 4 -rw-r–r– 1 jeffrin jeffrin 2 Aug 11 18:24 1 $flock -n 1 $echo 1 > 1 $ls -l total 4 -rw-r–r– 1 jeffrin jeffrin 2 Aug 11 18:29 1 $1 /var/loc local/ lock/ $1> /var/lock/mylock $cat …

Continue reading “flock – manage locks from shell scripts”

commandline session $mkdir 1 $pwd /home/jeffrin/Test $ls 1 $mkdir 2 $ls 1 2 $cd 2/ $mkdir -p hello/world $ls hello $cd hello/ $ls world $cd world/ $ls $pwd /home/jeffrin/Test/2/hello/world $cd – /home/jeffrin/Test/2/hello $pwd /home/jeffrin/Test/2/hello $ls world $ inner working mkdir.c