Linux Shell Script Essentials for DevOps | AWK | Regular Expressions | Boot Process

Linux Shell Script Essentials for DevOps | AWK | Regular Expressions | Boot Process | cksum Tutorial

#linuxtutorials #linuxandshelltutorials

Why case statement is used
Why sed is used
how do we define a function
how do we call a function
how do we delete a file using sed
AWK Command – extract the rows or column from output
Regular Experessions
———————
* – match 0 or more occurances
^ -carrot / begining of line
$ – ending
? – single charecter

Boot Process
—————
post
bios
mbr – master boot record
boot loader
kernal
/etc/inittab

who -r — run level

fsck — file system check

cd /a
tar -cvf sample.tar — will compress all files
zip/gzip — reduce the size of file
gzip -9 sample.tar — sample.tar.gz

scp — another machine

sample.tar.gz

gunzip sample.tar.gz — sample.tar

tar — xvf sample.tar — all 1000 files

cksum — to check the checksum

cksum filename — first name

cksum filename —
—————
/etc/

df -h — /xyz

installation of a package
unix
linux

var = ‘uname -na | cut -f1 -d” ” ‘

if [ $ var == Linux]
then
—-
else
——
fi

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