CentOS

How to check whether some library have been installed

Or simply use

rpm -qa | sort | grep libname

Another way is to use

yum list installed | grep software-name

General

How to login with SSH without password

Check here

How to send large files to remote computer

rsync --append --progress  SOURCE_FILE_PATH TARGET_FILE_PATH

Delete many files under some folder

find FOLDER_PATH -name "*.png" -print0 | xargs -0 rm

find FOLDER_PATH -name "*.png" -delete

How to find the functions in .so file

If the file is in elf format

readelf -Ws /usr/local/cuda/lib64/libcudart.so | grep Device

or (because You only should extract those that are defined in this .so file, not in the libraries referenced by it. Seventh column should contain a number in this case Here)

readelf -Ws /usr/local/cuda/lib64/libcudart.so | awk '{print $8} | grep Device'

For C++ functions

nm -gC libname.so

Media

How to convert videos in Ubuntu

Use avconv

avconv -i input.avi -s WxH  output.mov

convert images to videos

    avconv -r 10 -start_number 1 -framerate 10 -i IMAGE_FOLDER/det_%d.png -b:v 1000k -s 640x360 result.mov

Text

How to select multiple rows?

row index from 1

1. use awk (row 1-2)

   awk ‘NR >= 1 && NR <= 2 { print }’ /opt/visal/tmp/for_sijin/tmp/test.txt

2. use tail (from 100-end)

   tail -n +100 largefile

3. use head

   head -n +10 largefile

• linux