http://www.thelinuxwiki.com/api.php?action=feedcontributions&feedformat=atom&user=Jmtizzle
thelinuxwiki - User contributions [en]
2026-04-29T00:13:15Z
User contributions
MediaWiki 1.21.5
http://www.thelinuxwiki.com/index.php/bash_arithmetic
bash arithmetic
2015-01-02T02:17:12Z
<p>Jmtizzle: </p>
<hr />
<div><br />
== using let ==<br />
<br />
let "TOTAL = ( $A + 5 ) / $b"<br />
<br />
<br />
== floating point using bc ==<br />
<br />
TOTAL=`echo "( $A + 5 ) / $b" | bc -l<br />
<br />
'''using scale to control number of digits'''<br />
<br />
$ echo "1 / 100" | bc -l <br />
.01000000000000000000<br />
<br />
$ echo "scale =2; 1 / 100" | bc -l ~<br />
.01<br />
<br />
<br />
using expr<br />
a=`expr $a + 1`<br />
<br />
a=`expr 5 + 3`<br />
<br />
== bash built in hex 2 dec == <br />
'''hex digits ab a1 48 39'''<br />
<br />
$ echo $((0xab))<br />
171<br />
$ echo -e $((0xab)) $((0xa1)) $((0x48)) $((0x39))<br />
171 161 72 57<br />
<br />
'''hex to dotted quad IP notation'''<br />
<br />
$ echo 'aba14839' |sed 's/../ 0x&/g' |xargs printf "%d.%d.%d.%d\n"<br />
171.161.72.57<br />
<br />
<br />
<br />
[[category:bash]]</div>
Jmtizzle
http://www.thelinuxwiki.com/index.php/Linux_sound_alsa
Linux sound alsa
2015-01-02T01:50:33Z
<p>Jmtizzle: /* notes */</p>
<hr />
<div>A PCM stream is a digital representation of an analog signal<br />
<br />
<br />
== notes ==<br />
<br />
files of interest...<br />
<br />
/etc/conf.d/alsasound<br />
<br />
/usr/bin/alsaucm<br />
<br />
/usr/bin/alsamixer<br />
<br />
/usr/bin/alsa-info<br />
<br />
/usr/bin/alsaloop<br />
<br />
/usr/share/doc/alsa-lib-1.0.26<br />
<br />
/usr/share/doc/alsa-utils-1.0.26<br />
<br />
string of interest....<br />
<br />
echo "main(i){for(i=0;;i++)putchar(((i*(i>>17|i>>9)&46&i>>3))^(i&i>>10|i>>100));}" | gcc -x c - && ./a.out | aplay<br />
<br />
[[category:linux]]</div>
Jmtizzle
http://www.thelinuxwiki.com/index.php/formatted_netstat_-i_output
formatted netstat -i output
2015-01-01T20:25:59Z
<p>Jmtizzle: </p>
<hr />
<div>nice output<br />
# '''netstat -i | awk '{for (i=1; i<=12; i++) printf "%-12s",$i; printf "\n" }''''<br />
Kernel Interface table <br />
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg <br />
Mgmt 1500 0 44798753 0 0 0 27975618 0 0 0 BMRU <br />
Sync 1500 0 2963537772 3 0 0 1468012913 0 0 0 BMRU <br />
eth1-01 1500 0 1411174596 900025 0 0 1700760266 0 0 0 BMRU <br />
eth1-02 1500 0 621545020 0 0 0 699950334 0 0 0 BMRU <br />
eth1-03 1500 0 42298254 0 0 0 41409697 0 0 0 BMRU <br />
eth1-04 1500 0 118450353 0 0 0 91272698 0 0 0 BMRU <br />
eth1-06 1500 0 842911465 0 0 0 769682478 0 0 0 BMRU <br />
eth1-07 1500 0 1678630674 0 0 0 1262833128 0 0 0 BMRU <br />
eth1-07:0 1500 0 0 0 0 0 0 0 0 0 BMRU <br />
eth1-08 1500 0 66948888 0 0 0 42575976 0 0 0 BMRU <br />
eth2-01 1500 0 27193173 0 0 0 26951616 0 0 0 BMRU <br />
lo 16436 0 14102710 0 0 0 14102710 0 0 0 LRU <br />
<br />
regular, unformatted command...<br />
<br />
# '''netstat -i'''<br />
Kernel Interface table<br />
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg<br />
Mgmt 1500 0 42971857 0 0 0 33031217 0 0 0 BMRU<br />
Sync 1500 0 1437253374 0 26123 0 2901278387 0 0 0 BMRU<br />
eth1-01 1500 0 3233824068 2214586 104401 104401 3882515746 0 0 0 BMRU<br />
eth1-02 1500 0 2452468224 0 10073 10073 224918415 0 0 0 BMRU<br />
eth1-03 1500 0 47909107 0 0 0 48619706 0 0 0 BMRU<br />
eth1-04 1500 0 2121384593 0 0 0 1424105000 0 0 0 BMRU<br />
eth1-06 1500 0 3075678521 0 0 0 2825847210 0 0 0 BMRU<br />
eth1-07 1500 0 2082965114 0 2642073 2642073 3603131206 0 0 0 BMRU<br />
eth1-07:0 1500 0 0 0 0 0 0 0 0 0 BMRU<br />
eth1-08 1500 0 72183010 0 0 0 47803595 0 0 0 BMRU<br />
eth2-01 1500 0 25896410 0 0 0 26463622 0 0 0 BMRU<br />
lo 16436 0 265912189 0 0 0 265912189 0 0 0 LRU<br />
<br />
ezpz formatting via column - (x)<br />
# '''netstat -i |column -t'''<br />
Kernel Interface table<br />
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg<br />
Mgmt 1500 0 42971857 0 0 0 33031217 0 0 0 BMRU<br />
Sync 1500 0 1437253374 0 26123 0 2901278387 0 0 0 BMRU<br />
eth1-01 1500 0 3233824068 2214586 104401 104401 3882515746 0 0 0 BMRU<br />
eth1-02 1500 0 2452468224 0 10073 10073 224918415 0 0 0 BMRU<br />
eth1-03 1500 0 47909107 0 0 0 48619706 0 0 0 BMRU<br />
eth1-04 1500 0 2121384593 0 0 0 1424105000 0 0 0 BMRU<br />
eth1-06 1500 0 3075678521 0 0 0 2825847210 0 0 0 BMRU<br />
eth1-07 1500 0 2082965114 0 2642073 2642073 3603131206 0 0 0 BMRU<br />
eth1-07:0 1500 0 0 0 0 0 0 0 0 0 BMRU<br />
eth1-08 1500 0 72183010 0 0 0 47803595 0 0 0 BMRU<br />
eth2-01 1500 0 25896410 0 0 0 26463622 0 0 0 BMRU<br />
lo 16436 0 265912189 0 0 0 265912189 0 0 0 LRU<br />
<br />
<br />
[[category:monitoring]]</div>
Jmtizzle