AWESOME CLI TOOLS

hi,
 this one is a quick view of three tools at instance grep, sed and awk  

GREP: grep tool is used to find the pattern in a text file.

for example

$ grep 'mani' /etc/passwd

this will show the lines which contains the pattern 'mani' in it.


for more: man grep 

 SED: sed is an stream editor tool. we can edit the file without opening it. it saves lots of time.
for an instance this will substitude all the too -> to in a samp.txt

 $sed 's/too/to' samp.txt

to save the modified file have to redirect

$sed 's/too/to' samp.txt > moded.txt

for more: man sed 

AWK: last but not least awk is an awesome tool.
this will split the text fields by tabs or whitespaces.
we can also set the delimiter.

example:

 $df -h |awk '{print $1}'

this will print the first column of that df -h output.

for more: man awk