&&, cut, sort, uniq, grep, awk

&&

&& is used when we want to perform a series of commands based on the prev command being successful

ex- p1 && p2 && p3 means if p1 is successful only then p2 executes and so forth…

ls random.txt && cat random.txt
ls: fggfgdsgf: No such file or directory
ls: jjkjklj: No such file or directory
last line

cut

cut can be used to display content based on a delimiter

cat random.txt                                             ls: fggfgdsgf: No such file or directory
ls: jjkjklj: No such file or directory
last line
 
cat random.txt | cut -d: -f2                               fggfgdsgf
jjkjklj
last line

-d can be used to delimit based on a character

-f can be used to select the index

sort

sort can be used to sort based on a condition

cat random.txt | sort -bf                                  
last line
ls: fggfgdsgf: No such file or directory
ls: jjkjklj: No such file or directory

sort items (by alphabetical order, etc.)

uniq

only show unique output (duplicates not shown)

wc

“word count.” Count lines, letters, etc.

grep

unbelievably powerful searching/pattern-matching command.

grep ls random.txt | cut -d: -f1 | uniq                    

here for example we’re searching for ls in random.txt and delimiting it based on : and picking the first part of each line and displaying the unique results

awk

text processing command, designed to process structured text data like rows and columns

awk 'pattern {action}' filename
command | awk 'pattern {action}'

built in variables

• $0 → entire current line
• $1,$2, $3… → individual fields (columns)
• NF → number of fields in the current record
• NR → current record number
• FS - field separator (default - whitespace) ex-

awk '{print $1, $3}' file.txt # print specific columns
awk '/pattern/ {print}' file.txt # print line containing a pattern
awk -F',' '{print $1}' data.csv # custom line separator
 
cat test.txt
my name is aniket
 
grep name test.txt | awk -F' ' '{print $1}'
my

Links:

linux linux-commands

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