Author Archives: jeffrin

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

commandline session $ls sexample $cat sexample a b c d e f g h i j k l $split 3 sexample split: cannot open ‘3’ for reading: No such file or directory $split sexample 3 $ls 3aa sexample $ls -l total 8 -rw-r–r– 1 jeffrin jeffrin 24 Jul 31 21:52 3aa -rw-r–r– 1 jeffrin jeffrin …

Continue reading “split – split a file into pieces . split [OPTION]… [INPUT [PREFIX]]”

commandline session $mountpoint Usage: mountpoint [-q] [-d] [-x] path $mountpoint / / is a mountpoint $mountpoint /var /var is not a mountpoint $mountpoint /usr /usr is not a mountpoint $mountpoint -x /dev/sda1 8:1 $mountpoint -x /dev/sda2 8:2 $mountpoint -x proc mountpoint: proc: No such file or directory $mountpoint -x /proc/ mountpoint: /proc/: not a block …

Continue reading “mountpoint – see if a directory is a mountpoint”

commandline session $dict jeffrin No definitions found for “jeffrin” $dict -S Strategies available: exact Match headwords exactly prefix Match prefixes nprefix Match prefixes (skip, count) substring Match substring occurring anywhere in a headword suffix Match suffixes re POSIX 1003.2 (modern) regular expressions regexp Old (basic) regular expressions soundex Match using SOUNDEX algorithm lev Match headwords …

Continue reading “dict is a client for the Dictionary Server Protocol (DICT)”

commandline session $factor 5 5: 5 6 6: 2 3 7 7: 7 8 8: 2 2 2 9 9: 3 3 10 10: 2 5 11 11: 11 ^C $factor 12 12: 2 2 3 $