Linux - File Commands

This is Part 2 of the Linux CLI Commands series.

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File Commands

search files only in current directory
find . -maxdepth 1 -type f
ensures it won’t go into subdirectories (-maxdepth 1)
current directory (.)
only files (-type f)

ls -p | grep -v /
ls -p appends/to directory names
grep -v / excludes anything ending in /, leaving only files

ll -- long list file and directory
ls -- short list file and directory
ll -lrt -- file and directory are order by time
touch -- use to create a file
cat filename -- to read a files
cat > filename -- to create a file and also insert data
cat >> filename -- to append dates
mkdir -- use to create a directory
vi filename -- use to edit a file
yy -- to copy a single line
dd -- delete a single line
rmdir -- to remove a dir
rmdir -rf -- delete directory and inner files rf means recursive force
rm -- to delete a file
rm -rf -- if rm isn't work use rm -rf, rf means recursive fource
head filename -- show first 10 line
tail filename -- show last 10 line

Show line numbers (-n)
grep -n "failed" logfile.txt
grep -v "DEBUG" logfile.txt
Match whole words only (-w)
grep -w "root" /etc/passwd
nl filename -- show date with number line and skip the space in between lines
cat -n filname -- show all line with number
cp -- copy file
cp -R -- to copy a directory
diff file1 file2 -- to compare to files, output is only the different data
comm file1 file2 -- output with three column, fist col is file1 different data and second col is file2 different data and third col is common data col
wc filename -- list out the number of line, words, bites
pwd -- present working directory
cd -- change directory
cd .. -- previous directory
mv -- move or rename a file or directory
sort filename -- use sort a file in ascending order
sort -n filename -- use to sort numerical data
uniq filename -- remove duplicates
sort file.txt | uniq > output.txt
sort file.txt | uniq > temp.txt && mv temp.txt file.txt
split -3 filname -- splite a file into three
paste filename1 filename2 > filename3 -- file1 and file2 past or merge in file3
fmt filename -- convert column into a single row
strings filename -- use to read a file understandable format