compress:   sEx a FileName.* FileName
uncompress: sEx x FileName.*

cd /root/Desktop/folder
tar xf /root/Documents/file.tar.gz

tar xf file.tar.gz -C /root/Desktop/folder

cat /usr/local/cuda/include/cudnn.h | grep CUDNN_MAJOR -A 2

sed -n '20,40p' file_name

sed -n '20,40p;41q' file_name

awk 'FNR>=20 && FNR<=40' file_name

$ sed -n -e 5,8p -e 10p file
Line 5
Line 6
Line 7
Line 8
Line 10

wget "http://domain.com/directory/4?action=AttachFile&do=view&target=file.tgz"

wget -O /home/omio/Desktop/ "http://thecanadiantestbox.x10.mx/CC.zip"

wget -r --no-parent --reject "index.html*" http://vision.cs.utexas.edu/voc/

scp account@111.111.111.111:/path/to/remote/file /path/to/local/

scp /path/to/local/file account@111.111.111.111:/path/to/remote/

ls -l -R

ls -lF |grep /

ls -l |grep '^d'

history

history | less

rename -n 's/\.htm$/\.html/' \*.htm

rename -v 's/\.htm$/\.html/' \*.htm

for i in `ls`; do mv -f $i `echo $i | sed 's/^./q/'`; done

for file in `ls`
do
  newfile =`echo $i | sed 's/^./q/'`
　mv $file $newfile
done

for i in `ls`; do mv -f $i `echo $i | sed 's/^...../abcde/'`;

for i in `ls`; do mv -f $i `echo $i | sed 's/.....$/abcde/'`;

for i in `ls`; do mv -f $i `echo "abcde"$i`; done

for i in `ls`; do mv -f $i `echo $i | tr a-z A-Z`; done

wc -l /dir/file.txt

cat /dir/file.txt | wc -l

grep -w "pattern" -c file

grep -w "pattern" -c -v file

ls -l | grep “^-” | wc -l

ls -lR /home/account | grep js | wc -l

ls -l "/home/account" | grep "js" | wc -l

ls -lR | grep “^-” | wc -l

ls -lR | grep “^d” | wc -l

grep -o objStr  filename|wc -l
grep -o ‘objStr1\|objStr2'  filename|wc -l

:%s/objStr//gn

find -iname "filename"

grep -rnw '/path/to/somewhere/' -e "pattern"

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

grep --exclude=*.o -rnw '/path/to/somewhere/' -e "pattern"

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

fgrep -o 'aaa' <file> | wc -l

find /home/ -type f -size +512k -exec ls -lh {} \;

    b – for 512-byte blocks (this is the default if no suffix is used)
    c – for bytes
    w – for two-byte words
    k – for Kilobytes (units of 1024 bytes)
    M – for Megabytes (units of 1048576 bytes)
    G – for Gigabytes (units of 1073741824 bytes)

gdb --arg python demo.py 2>&1 | tee demo.log

import pdb
pdb.set_trace()

nohup command-with-options &

nohup xxx.sh 1 > log.txt 2>&1 &

ps -ef | grep "command name"

nohup command-with-options & 
echo $! > save_pid.txt
kill -9 `cat save_pid.txt`

-b  Build the cross-reference only.
-C  Ignore letter case when searching.
-c  Use only ASCII characters in the cross-ref file (don’t compress).
-d  Do not update the cross-reference.
-e  Suppress the -e command prompt between files.
-F  symfile Read symbol reference lines from symfile.
-f  reffile Use reffile as cross-ref file name instead of cscope.out.
-h  This help screen.
-I  incdir Look in incdir for any #include files.
-i  namefile Browse through files listed in namefile, instead of cscope.files
-k  Kernel Mode – don’t use /usr/include for #include files.
-L  Do a single search with line-oriented output.
-l  Line-oriented interface.
-num  pattern Go to input field num (counting from 0) and find pattern.
-P  path Prepend path to relative file names in pre-built cross-ref file.
-p  n Display the last n file path components.
-q  Build an inverted index for quick symbol searching.
-R  Recurse directories for files.
-s  dir Look in dir for additional source files.
-T  Use only the first eight characters to match against C symbols.
-U  Check file time stamps.
-u  Unconditionally build the cross-reference file.
-v  Be more verbose in line mode.
-V  Print the version number.

:r! echo %

:80,90s/^/#/

gt            go to next tab
gT            go to previous tab
{i}gt         go to tab in position i

za

vimdiff file1 file2

:vert diffsplit file2

cd /usr/local/bin/
sudo ln -s /usr/local/MATLAB/R2012a/bin/matlab Matlab
gedit ~/.bashrc
alias matlab="/usr/local/MATLAB/R2012a/bin/matlab"

matlab -nojvm -nodisplay -nosplash

#!/bin/sh
cd /path/to/detection-proposals
matlab -nojvm -nodisplay -nosplash -r "startup; callRunCOCO; exit"

time=`date +%Y%m%d_%H%M%S`
cd /path/to/detection-proposals
nohup ./runGenerareSSProposals.sh > runGenerareSSProposals_${time}.log 2>&1 &
echo $! > save_runGenerareSSProposals_val_pid.txt

hadoop fs -rm -r -f /user/the/path/to/your/dir

ln -s EXISTING_FILE SYMLINK_FILE
ln -s /path/to/file /path/to/symlink

eog /path/to/image/im.jpg

display /path/to/image/im.jpg

sudo dos2unix /path/to/file

sed -i 's/\r//' /path/to/file

sudo sed -i -e 's/\r$//' /path/to/file

sed 's?^?'`pwd`'/detection_images/?; s?$?.jpg?' trainval.txt > voc.2007trainval.list

paste -d " " file1.txt file2.txt

shuf file.list > file_shuffled.list

cat file1 file2 file3 .... >> merged_file

cat -A filename

find /path/to/folder

find /path/to/folder -type f

rm `find -type f /path/to/dir/ | grep "filetype"`

rm `find -type f /path/to/dir/ | grep -E "filetype1 | filetype2"`

zip -r target.zip file1 file2 folder1 folder2

sed -i 's/^M$//g'

sed -i 's/^I//g'

sort {file-name} | uniq -u

perl -lne '$seen{$_}++ and next or print;' data.txt > output.txt

./do_something.sh || exit 1

str="/aaaa/bbbbb/cccc"
echo $str | tr "/" "\n"