linux command

linux-command.sh

// connect remote server with ssh
ssh -p {port_number} {host_name(ip_address)}

// find file by last modified date(older than 30days ago).
find {target_directory} -mtime +30

// delete found files by find command
find ./ -name "{file_name}" -exec rm -rf {} \;

// replace part of file name(a to b)
// find . -type f -print0 | while read -r -d '' file; do mv "$file" "${file/a/b}"; done
find . -type f | while read -r file; do mv "$file" "${file/a/b}"; done
[option]
-type f: find target is file
-r : disable escape with backSlash

// set shell variable
set {VALUE_NAME}=value

// copy confirm override and show file name
cp -iv {source} {target}
[option]
i: confirm override(interactive)
v: show file name(verbose)

// create new tar.gz file
tar zcvf {dest}.tar.gz {source}

// make multi directory
mkdir -p ${directory}/{sub_directory1,sub_directory2}

// install deb package
dpkg -i {package_name}.deb
[option]
i: install package

// change group temporary
newgrp {group_name}

// show userId, groupId
id

// file synchronization
rsync -avz {source} {dest}

// destruction result of command
{command} > /dev/null 2>&1

// output each directory created message 
mkdir -v {directory_name}

// input file and delete \n and output file
tr -d "\n" < {input_file} > {output_file}

// get package list from server
apt-get update

// download public key
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys {key}

// set environment variable
setenv {environment_variable} {value}

// copy keep file attribute and directory structure as much as possible
copy -a {source} {dest}

// echo 11 to 20
echo `seq 11 20`

// show file list order by modified date
ls -alt