Linux Command Knowhow

■Copy between two machines:

    scp srcFile destUser @ destIP: destDir

■Login from one machine to another

    ssh [email protected]

■View a certain progress information

      ps -ef | grip processName

■Copy files in the machine

    cp srcFile destFile

    copy folder

    cp srcDir -r srcDir

■Empty the contents of a file

    ehco "" > fileName

■ zip package

    zip zipFilename.zip -r srcDir

■Unzip the zip package

    unzip srcZIP -d destDir

■Tar package

    tar czvf xx.tar.gz   file/dir

■Decompression

    tar xzvf /tmp/etc.tar.gz

■Give maximum permissions to paths or files

    chmod -R 777 xxxxxx

■Give executable permission to a path or file

    chmod +x xxxxxxx

■Install rpm

    rpm -ivh xxx.rpm

    rpm -ivh --force xxx.rpm (force installation)

■Uninstall rpm

    rpm -e xxx.rpm

■View environment variables

    vim /etc/profile

■Enable environment variables

    source /etc/profile

■Change time

    date -s 14:36:00 (change time only)

    date -s "2008-08-08 12:00:00" (date and time are changed)

■Find files

 

    find / -iname "*.txt" (i ignore case, name by name)