Tuesday, May 23, 2023
Monday, May 22, 2023
Error : -bash: ifconfig: command not found
Error : -bash: ifconfig: command not found
Login as root user :
[root@0.0.0.0]#
[root@0.0.0.0]#
[root@0.0.0.0]#
[root@0.0.0.0]# ifconfig
-bash: ifconfig: command not found
[root@0.0.0.0]#
[root@0.0.0.0]#
[root@0.0.0.0]#
Install net-tools package using yum command
[root@0.0.0.0]# yum install net-tools
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered with an entitlement server. You can use subscription-manager to register.
Last metadata expiration check: 0:01:33 ago on Mon 22 May 2023 04:36:53 PM UTC.
Dependencies resolved.
==============================================================================================================================
Package Architecture Version Repository Size
==============================================================================================================================
Installing:
net-tools x86_64 2.0-0.52.20160912git.el8 rhel-8-baseos-rhui-rpms 322 k
Transaction Summary
==============================================================================================================================
Install 1 Package
Total download size: 322 k
Installed size: 942 k
Is this ok [y/N]: y
Downloading Packages:
net-tools-2.0-0.52.20160912git.el8.x86_64.rpm 9.4 MB/s | 322 kB 00:00
------------------------------------------------------------------------------------------------------------------------------
Total 6.1 MB/s | 322 kB 00:00
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : net-tools-2.0-0.52.20160912git.el8.x86_64 1/1
Running scriptlet: net-tools-2.0-0.52.20160912git.el8.x86_64 1/1
Verifying : net-tools-2.0-0.52.20160912git.el8.x86_64 1/1
Installed products updated.
Installed:
net-tools-2.0-0.52.20160912git.el8.x86_64
Complete!
[root@0.0.0.0]#
[root@0.0.0.0]#
[root@0.0.0.0]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 9001
inet 172.21.31.211 netmask 255.255.240.0 broadcast 172.31.31.255
inet6 f80::6:3ccf:fe7d:1a13 prefixlen 64 scopeid 0x20<link>
ether 0a:76:33:7d:1a:13 txqueuelen 1000 (Ethernet)
RX packets 86484 bytes 127950677 (122.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11182 bytes 1084233 (1.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 509 bytes 77514 (75.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 509 bytes 77514 (75.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@0.0.0.0]#
[root@0.0.0.0]#
How to download file using wget and curl command in linux ?
Download file using wget and curl command in linux
[root@0.0.0.0 ~]# rpm -qa | grep -i wget
wget-1.19.5-11.el8.x86_64
[root@0.0.0.0 ~]#
Using wget commnad :
[root@0.0.0.0 ~]#
[root@0.0.0.0 ~]# wget https://the.earth.li/~sgtatham/putty/latest/putty-0.78.tar.gz
--2023-05-22 15:44:09-- https://the.earth.li/~sgtatham/putty/latest/putty-0.78.tar.gz
Resolving the.earth.li (the.earth.li)... 93.93.131.124, 2a00:1098:86:4d:c0ff:ee:15:900d
Connecting to the.earth.li (the.earth.li)|93.93.131.124|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://the.earth.li/~sgtatham/putty/0.78/putty-0.78.tar.gz [following]
--2023-05-22 15:44:10-- https://the.earth.li/~sgtatham/putty/0.78/putty-0.78.tar.gz
Reusing existing connection to the.earth.li:443.
HTTP request sent, awaiting response... 200 OK
Length: 2811628 (2.7M) [application/x-gzip]
Saving to: ‘putty-0.78.tar.gz’
putty-0.78.tar.gz 100%[=====================================================>] 2.68M 4.71MB/s in 0.6s
2023-05-22 15:44:10 (4.71 MB/s) - ‘putty-0.78.tar.gz’ saved [2811628/2811628]
[root@0.0.0.0 ~]#
Using curl command :
[root@0.0.0.0 tmp]# curl -O https://the.earth.li/~sgtatham/putty/latest/putty-0.78.tar.gz
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 306 100 306 0 0 1066 0 --:--:-- --:--:-- --:--:-- 1066
[root@0.0.0.0 tmp]#
[root@0.0.0.0 tmp]#
Friday, May 19, 2023
How to check User Shell details ?
Check User Shell details :
[root@0.0.0.0]# cat /etc/passwd
root:x:0:0:root:/root:/bin/bash
[root@0.0.0.0]# echo $0
-bash
[root@0.0.0.0]#
How to check available shell in Linux OS ?
Check available shell in Linux OS :
[root@0.0.0.0]# cat /etc/shells
/bin/sh
/bin/bash
/usr/bin/sh
/usr/bin/bash
/bin/ksh
/bin/rksh
/usr/bin/ksh
/usr/bin/rksh
[root@0.0.0.0]#
How to know Linux OS is 64 bit or 32 bit ?
How to know Linux OS is 64 bit or 32 bit ?
First Method :
[root@0.0.0.0]#
[root@0.0.0.0]# which arch
/usr/bin/arch
[root@0.0.0.0]#
[root@0.0.0.0]#
[root@0.0.0.0]#
[root@0.0.0.0]# arch
x86_64
[root@0.0.0.0]#
[root@0.0.0.0]#
[root@0.0.0.0]#
Second Method :
[root@0.0.0.0]# uname -a
Linux ip-172-31-19-40.ec2.internal 4.18.0-425.19.2.el8_7.x86_64 #1 SMP Fri Mar 17 01:52:38 EDT 2023 x86_64 x86_64 x86_64 GNU/Linux
[root@0.0.0.0]#
This is 64 bit Operating System because of output is x86_64
Thursday, May 18, 2023
How to get metadata details for AWS EC2 instance using curl command
Get metadata details for AWS EC2 instance using curl command
[root@]# curl http://169.254.169.254/2018-09-24/meta-data
ami-id
ami-launch-index
ami-manifest-path
block-device-mapping/
events/
hibernation/
hostname
identity-credentials/
instance-action
instance-id
instance-type
local-hostname
local-ipv4
mac
metrics/
network/
placement/
profile
public-hostname
public-ipv4
public-keys/
reservation-id
security-groups
services
Example:
[root@]# curl http://169.254.169.254/2018-09-24/meta-data/security-groups
kpitdb-demo-db-sg
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