1) How to Print only Blank Line of File.
sed -n '/^$/p' data_file.txt
2) To Print all lines Except First Line
sed –n ‘1!p’ data_file.txt
3) To Print First and Last Line using Sed Command
sed -n ‘1p’ data_file.txt
sed –n ‘$p’ data_file.txt
4) How to get only Zero Byte files that are present in the directory
ls -ltr| awk '/^-/ { if($5 ==0) print $9 }'
5) How to add a First record and Last Record to the current file in Linux
sed -i -e '1i Header' -e '$a Trailor' data_file.txt
6) Delete all Line except First Line
sed –n ‘1!d’ data_file.txt
7) How to display an Even number of records into one file and Odd number of records into another file
awk 'NR %2 == 0' data_file.txt
awk 'NR %2 != 0' data_file.txt
8) Add at the start of the line
awk '{print "START"$0}' FILE
9) Add at end of the line
awk '{print $0"END"}' FILE
10)Remove all empty lines:
sed '/^$/d' data_file.txt or sed '/./!d' data_file.txt
11) To see a particular line
For example, if you just want to see the 180th line in a file
sed -n '180p' testfile.txt
12) To find a particular column in the file
cat data_file.txt |awk -F"," '{print $2}'
13) To rename the file with the current date
mv test test_`date +%Y-%m-%d
14) Command to take out all those lines which are having 8 at 17th position
grep '^.\{16\}8' data_file.txt > modifeid_data_file.txt
15) To remove the nth line without opening the file
sed 'nd' file1>file2 to remove multiple lines sed -e 1d -e 5d
16) To find the top 20 files with the most space
ls -ltr|awk -F" " '{print $5 $9}' sort -n tail -20
17) To find the record in the first file, not in the second
comm -13 data_file.txt data_file2.txt
18) If you are looking from something that is contained in a file but you don't know which directory it is in do the following:
find. -name "*" xargs grep -i something This will find all of the files in the directory and below and grep for the string something in those files!
19) Delete Files Delete all the files starting with the name data_file
find. -type f -name "data_file*" exec rm -f {} \;
20) Remove blank space from the file
sed -e "s/ *//g" data_file.txt >data_file.txt_wo_space
21) How to do grep on a large number of files in a directory
grep -rl "Search Text" /tmp
22) Get all the columns from the file and record the count for each of the columns?
head -n 1 file.name | awk -F'|' '{print NF; exit}'
No comments:
Post a Comment