UBUNTU - Useful and basic commands

If you are working on an ubuntu linux OS, those command would be pretty useful for you:

# Remove files with a precisely extension.

find . -type f -iname \*.jpg -delete

# Copy an entire folder with its contents

cp -a <source> <destination>

# List installed packages related to something

dpkg -l | grep <filter_description>

# Show n lines before and after, on a grep

cat <file_to_inspect> | grep -C10 '<description_to_filter>' #will show 10 lines above and below your description

cat <file_to_inspect> | grep -B10 '<description_to_filter>' #will show 10 lines before your description

cat <file_to_inspect> | grep -A10 '<description_to_filter>' #will show 10 lines after your description

# Remove first n lines from a large file (eg: 43 first lines)

tail -n +43 <file> > <file_2>

# Get last n lines from a large file (eg: 43 last lines)

tail -n 43 <file> > <file_2>

# Replace all occurrences of a string on a large file

sed -i 's/<original_str>/<new_str>/g' <file_name>

# Replace an string in multiple files ("foo" will be replaced by "bar")

cd /path/to/your/folder

sed -i 's/foo/bar/g' *

To manipulate, and compress/uncompress files or directories:

# Compress a directory or files

tar -zcvf backup.tar.gz directory-you-want-compresss/

tar -zcvf backup2.tar.gz file1 file2 file3

# Uncompress a directory or files

tar -xvf backup.tar.gz directory-you-want-uncompresss/

## Working with ZIP / RAR files

sudo apt-get install zip

# Compress zip/rar file

zip backup.zip directory-you-want-compresss/

zip backup.zip file1 file2 file3

# Compress zip/rar file

unzip backup.zip directory-you-want-compresss/

unzip backup.zip file1 file2 file3

How to find the path of a file based on its name

1	locate -br '^<filename.extension>$'

In order to work with mysql databases

# Create a dump for your database

mysqldump -u user -p'password' DBName > your-dump-file.sql

# Import a dump file

cd /path/to/your/assets/folder

mysql -u user -p'password'

create dabase new_database_name;

use new_database_name;

source your-dump-file.sql;

# Export just one table

mysqldump -u user -p'password' DBname TableName > your-dump-file.sql

# Import just one table

mysql -u root -p'password' DBname < your-dump-file.sql

# logged to mysql service:

SHOW DATABASES; # Show all databases.

SHOW DATABASES LIKE '%<filter>%'; # Show databases which names corresponds to the filter.

use <db_name>;

SHOW TABLES; # Show all tables in used database

SHOW TABLES LIKE '%<filter>%'; # Show all tables which names corresponds to the filter.

Copy files via SCP (Secure copy)

# You need to use your ssh credentials to operate via scp.

# To upload a file

scp newfiles.tar.gz <sshuser>@<sshdomain>:<destination path>

# To download a file

# (if you are running the command wherever you want the file, just use . as <local destination path>)

scp <sshuser>@<sshdomain>:<server origin file path> <local destination path>

Find text inside files

# Find a simple text inside files of directory

grep -rnw '/dir/to/look' -e 'pattern'

-r or -R is recursive,

-n is line number, and

-w stands for match the whole word.

-l (lower-case L) can be added to just give the file name of matching files.

# This will only search through those files which have .c or .h extensions:

grep --include=\*.{c,h} -rnw '/dir/to/look' -e "pattern"

# Also, you can exclude directories on your search

grep --exclude-dir={dir1,dir2,*.dst} -rnw '/dir/to/look' -e "pattern"

MD5 Encription of a file

1	md5sum <your_filename>

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UBUNTU – Useful and basic commands