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= System =
= System =
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* xargs - to be processed - [http://offbytwo.com/2011/06/26/things-you-didnt-know-about-xargs.html Things you (probably) didn’t know about xargs]
* xargs - to be processed - [http://offbytwo.com/2011/06/26/things-you-didnt-know-about-xargs.html Things you (probably) didn’t know about xargs]
Ignore "Permission denied" errors
<syntaxhighlight lang="bash">
$ find . 2>&1 | grep -si "sfrrgam"
</syntaxhighlight>


== LVM ==
== LVM ==
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These commands remove volumes named ''laravelhome'' and ''laravelhtml'', and then increase ''lv_var'' volume with the remaining space.
These commands remove volumes named ''laravelhome'' and ''laravelhtml'', and then increase ''lv_var'' volume with the remaining space.


<source lang="console">
<syntaxhighlight lang="console">
[root@it153coai01lnx ~]# lsblk
[root@it153coai01lnx ~]# lsblk
NAME                MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
NAME                MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
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/dev/mapper/vg00-lv_varlog  3.8G  103M  3.7G  3% /var/log
/dev/mapper/vg00-lv_varlog  3.8G  103M  3.7G  3% /var/log
tmpfs                      182M    0  182M  0% /run/user/4323
tmpfs                      182M    0  182M  0% /run/user/4323
</source>
</syntaxhighlight>




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{{testedon|2020-07-06|CentOS 8.1.1911}}
{{testedon|2020-07-06|CentOS 8.1.1911}}


<source lang="console">
<syntaxhighlight lang="console">
[root@chara mhan]# lsblk
[root@chara mhan]# lsblk
NAME                  MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
NAME                  MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
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tmpfs                          1.6G  4.0K  1.6G  1% /run/user/1000
tmpfs                          1.6G  4.0K  1.6G  1% /run/user/1000
[root@chara mhan]#
[root@chara mhan]#
</source>
</syntaxhighlight>
 
 
=== Separating out /srv to a dedicated LVM ===
 
{{testedon|2023-10-09|RHEL 8.8}}.  LoboCloud VM w/ 250 addl.
 
<syntaxhighlight lang="bash">
# pvcreate /dev/sdb
# vgcreate vgapps /dev/sdb
# lvcreate -n lv_www -L 100G vgapps
# mkfs.xfs /dev/mapper/vgapps-lv_www
# mount /dev/mapper/vgapps-lv_www /mnt
# mv -a /srv/* /mnt/
# vi /etc/fstab
/dev/mapper/vgapps-lv_www /srv xfs defaults 0 0
# umount /mnt
# mount /dev/mapper/vgapps-lv_www /srv
</syntaxhighlight>
 
To access the old /srv folder
 
<syntaxhighlight lang="bash">
# mount -o bind / /mnt
</syntaxhighlight>


=== Links ===
=== Links ===
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List all audio cards you have:
List all audio cards you have:


<source lang="bash">
<syntaxhighlight lang="bash">
$ cat /proc/asound/cards
$ cat /proc/asound/cards
  0 [PCH            ]: HDA-Intel - HDA Intel PCH                                                                                                                 
  0 [PCH            ]: HDA-Intel - HDA Intel PCH                                                                                                                 
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  2 [SoundBar      ]: USB-Audio - Dell AC511 USB SoundBar                                                                                                       
  2 [SoundBar      ]: USB-Audio - Dell AC511 USB SoundBar                                                                                                       
                       Dell Dell AC511 USB SoundBar at usb-0000:00:14.0-4, full speed
                       Dell Dell AC511 USB SoundBar at usb-0000:00:14.0-4, full speed
</source>
</syntaxhighlight>


Get ALSA identifiers of those:
Get ALSA identifiers of those:


<source lang="bash">
<syntaxhighlight lang="bash">
$ aplay -l | awk -F \: '/,/{print $2}' | awk '{print $1}' | uniq                                                                                 
$ aplay -l | awk -F \: '/,/{print $2}' | awk '{print $1}' | uniq                                                                                 
PCH                                                                                                                                                             
PCH                                                                                                                                                             
NVidia                                                                                                                                                         
NVidia                                                                                                                                                         
SoundBar
SoundBar
</source>
</syntaxhighlight>


Update /etc/asound.conf:
Update /etc/asound.conf:


<source lang="ini">
<syntaxhighlight lang="ini">
pcm.!default {
pcm.!default {
         type hw
         type hw
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         card SoundBar
         card SoundBar
}
}
</source>
</syntaxhighlight>


I found that the numeric identifier for these cards and change on reboot.  That may be related to how the hardware detection works on Linux, and the order changes time to time.  So I've used the string identifier instead -- seems to stick better than a numeric value.
I found that the numeric identifier for these cards and change on reboot.  That may be related to how the hardware detection works on Linux, and the order changes time to time.  So I've used the string identifier instead -- seems to stick better than a numeric value.
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Restart pulseaudio. Do not sudo for this.
Restart pulseaudio. Do not sudo for this.


<source lang="console">
<syntaxhighlight lang="console">
$ pulseaudio -k && pulseaudio -D
$ pulseaudio -k && pulseaudio -D
</source>
</syntaxhighlight>


List sinks.
List sinks.


<source lang="console">
<syntaxhighlight lang="console">
$ pacmd list-sinks
$ pacmd list-sinks
1 sink(s) available.
1 sink(s) available.
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         active port: <analog-output>
         active port: <analog-output>
</source>
</syntaxhighlight>




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| Scan a network for connected computers  
| Scan a network for connected computers  
| class="cli" | $ sudo nmap -sP 129.24.22.0/24
| class="cli" | $ sudo nmap -sP 129.24.22.0/24
|
|-
| Check for an open port
| class="cli" | $ nc -zv 192.168.86.108 1523<br/>$ cat < /dev/tcp/host.server.com/22
|
|
|}
|}
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{{testedon|2020-10-21|RHEL 7.8}}
{{testedon|2020-10-21|RHEL 7.8}}


<source lang="console">
<syntaxhighlight lang="console">
# running a yum update yields the following
# running a yum update yields the following
   file /etc/os-release from install of redhat-release-server-7.9-3.el7.x86_64 conflicts with file from package oraclelinux-release-7:7.8-1.0.7.el7.x86_64
   file /etc/os-release from install of redhat-release-server-7.9-3.el7.x86_64 conflicts with file from package oraclelinux-release-7:7.8-1.0.7.el7.x86_64
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$ sudo find /var/cache/yum -type f -name "redhat-release-server*" -exec rpm -Uvh --force {} \;
$ sudo find /var/cache/yum -type f -name "redhat-release-server*" -exec rpm -Uvh --force {} \;
$ sudo yum --disablerepo="*" --enablerepo="rhel*" --disablerepo="oraclelinux*" --disablerepo="rhel-source*" --disablerepo="rhel-beta*" update -y && sudo yum -y upgrade && sudo yum -y autoremove
$ sudo yum --disablerepo="*" --enablerepo="rhel*" --disablerepo="oraclelinux*" --disablerepo="rhel-source*" --disablerepo="rhel-beta*" update -y && sudo yum -y upgrade && sudo yum -y autoremove
</source>
</syntaxhighlight>




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