Linux Command —— cut / grep /sort /uniq /wc

cut

echo $PATH | cut -d  ':'  -f 3,5
1

• -d Use colon instaed TAB as a field delimiter ,and
• -f Select 3 to 5 fields of the line data .also print line data with no delimiter charater,unless the -s option is specified

grep

grep  [-cinv]  'target string'  filename 
1

cat file1 | grep  [-cinv]  'target string'
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• -c print the count of matching line in the input file
• -i serach the target string ingoring case distinction
• -n print result line number
• -v Invert the sense of matching .print line data with no target string

sort

cat file1 | sort  [-frutk] 
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• -f ingore case distinction
• -r revert the order
• -u list only one line if line data same with each other
• -t use specified delimeter charater instead of TAB
• -k order by specified field

uniq

cat file1 | uniq   [-ic] 
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only print unique lines ,report or omit repeated lines

• -i igonre case distinction
• -c print line count

wc

cat file1 | wc 
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• -c, --bytes
  print the byte counts

• -m, --chars
  print the character counts

• -l, --lines
  print the newline counts