Linux useful commands

#find the binary files 

find . -type f | perl -lne 'print if -B'

another method is grep

grep -r -I -L -Z . | xargs -0 ls -l

-L : list the binary file
-r : rescusive
-Z ：printf NULl byte after filename

xargs： run command, here is 'ls -l' 
-0 : is the parameter of xargs 

#show directory size 

du -h

du : disk usage

#history

histoy to list the histoy commands

#show the file path

find . -type f

other options can be : -type [bcdpflsD], d: is only directory

example:

./u-boot-imx_%.bbappend
./u-boot-imx/Kconfig.patch
./u-boot-imx/board/bosch/ulpanel/plugin.S

#list the file permission in number e.g. 666

stat -c "%a %n" *

#compress a current date folder

DIR=$(date "+%Y%m%d")
tar -zcf $DIR.tar.gz $DIR

#change the real name of user

sudo chfn -f "FirstName LastName" *username*

#backup file auto create sub folders

rsync -a -r ~/Documents/newsys/yocto/zeus/build/conf $DIR/
rsync -a -r ~/Documents/newsys/yocto/zeus/meta-ul_bsp $DIR/

#Putty

sudo apt-get install putty
after plug-in the imx6ullevk board to linux, the device is /dev/ttyUSB0
In my linux, I cannot open this device because I do not belong to ttyUSB0 groups (root dialout).
1)check the you belong. groups username
2)add to dialout group
>sudo usermod -a -G dialout zjb
or you can direct change the file : sudo vim /etc/group
3) you need restart or logout

#Quick copy the selected text  as input in terminate

using middle button of mouse.

#Create a series of folder

install -d arch/arm/boot/dts

or mkdir -p arch/arm/boot/dts

tree .

.
└── arch
    └── arm
        └── boot
            └── dts

#Info

Almost all the standard Linux programming tools (including ld, the linker; as, the assembler; and gprof, the profiler) come with useful Info pages.

e.g. info uname

#cat misc.

cat xxx | more

cat xxx | less

cat > xxx , create a file xxx

cat -n xxx | more with line number information.

cat aaa.txt >> bbb.txt, the aaa.txt will be appened to bbb.txt

#create a user belong to root group

>sudo su

>adduser yourname

>usermod -aG sudo username

>su - username

>sudo whoami

su : switch user

sudo ： The sudo command allows you to run programs as another user, by default the root user. If you spend a lot of time on the command line, sudo is one of the commands that you will use quite frequently.

#get the user group

>groups

>id

#using awk to get the device major number

in a shell file, to get the device major number

major =$(awk '/scull/ print {$1}' /proc/devices)

#tail a file with auto update when file change

tail -f /var/log/syslog

#makefile with detail commands infomation 

make V = 1 , which will show the detailed commands

#To switch root user

sudo su switch to root user

using exit to go back to login user

#To check which driver is mounting for CD-ROM

just typeing mount in terminate

/dev/sda2 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/cgroup type tmpfs (rw)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
none on /sys/firmware/efi/efivars type efivarfs (rw)
udev on /dev type devtmpfs (rw,mode=)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=,mode=)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=%,mode=)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=)
none on /run/shm type tmpfs (rw,nosuid,nodev)
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=,mode=)
none on /sys/fs/pstore type pstore (rw)
/dev/sda1 on /boot/efi type vfat (rw)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
systemd on /sys/fs/cgroup/systemd type cgroup (rw,noexec,nosuid,nodev,none,name=systemd)
gvfsd-fuse on /run/user//gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,user=zjb)
/dev/sr0 on /media/zjb/UDF Volume type udf (ro,nosuid,nodev,uid=1000,gid=1000,iocharset=utf8,umask=0077,uhelper=udisks2)

#To create ISO from CD-ROM

dd if=source of=destination

example, dd if=/dev/sr0 of=windows.iso

#To create ISO from folder

apt-get install genisoimage

genisoimage -o output_image.iso -J -R -l directory_name

-J -R -l is to keep the original filename

#To install .deb file

sudo dpkg -i /path/to/deb/file

sudo apt install ./name.deb

#source bash_file

source is a Unix command that evaluates the file following the command, as a list of commands, executed in the current context

#lz4c not found

apt-get install liblz4-tool

#mkfs.ubifs not found

apt-get install mtd-utils

#Installing the ncurses library which may used in make menuconfig

libncurses5-dev : Developer’s libraries for ncurses
libncursesw5-dev : Developer’s libraries for ncursesw

#tree list the folder/file in a tree way

tree -d directory only

tree -d -f  full file.

#.bashrc

.bashrc文件主要保存个人的一些个性化设置，如命令别名、路径等。

.bash_profile'只在会话开始时被读取一次，而'.bashrc'则每次打开新的终端时，都要被读取。

要定义一个全局变量，使在以后打开的终端中生效，您需要将局部变量输出(export)，可以用"export"命令：

export PATH=$PATH:/some/directory

#get the inserted disk or sd card

sudo fdisk -l

or using

lsblk

so you can find the usb device is on media/xxxx, you can visit by cd media/xxx

#generate the patch file

e.g. diff -Nupr --no-dereference xyssl-0.8/ xyssl-0.8-dll/ >xyssl.patch

#find a file

find . -name xxx.file

#grep a word 

grep [options] pattern [files]

grep yocto readme.txt, search yocto in readme.txt file
grep 'yocto\|org' readme.txt , search yocto or org in readme.txt file
ps -aux | grep timer, only list the timer process in ps output 
example below..
grep -rnw '/path/to/somewhere/' -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.

Along with these, --exclude, --include, --exclude-dir flags could be used for efficient searching:

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

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

• This will exclude searching all the files ending with .o extension:

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

• For directories it's possible to exclude a particular directory(ies) through --exclude-dir parameter. For example, this will exclude the dirs dir1/, dir2/ and all of them matching *.dst/:

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

This works very well for me, to achieve almost the same purpose like yours.

For more options check man grep.

#Linux 下计算代码行数的工具

cloc

http://cloc.sourceforge.net/

#source and .

you can replace the first . as source, example . ./oe-init-build-env,  you can run as : source ./oe-init-build-env,

source is a shell built-in command which is used to read and execute the content of a file(generally set of commands), passed as an argument in the current shell script. It has a synonym in .

#using samba to visit network driver

1)      Install cifs tool:

sudo apt-get install cifs-utils

2)      Create the local folder for mount (I would recommend you not to create these folder directly under your home directory, because it cause it slowly to every time you open your home directory)

~$ mkdir ~/RND-tool

3)      create the credentials

~$ gedit ~/.smbcredentials

4)      Add the following content to it (not include ‘[‘&’]’):

username=[ user name]

password=[password]

Save the file

1)      Change the permission:

~$ chmod 600 ~/.smbcredentials

2)      Edit /etc/fstab

~$ sudo gedit /etc/fstab

3)      add the following content: network disk folder

//10.54.128.19/folder$ /home/[your ubuntu user name]/RND-tool cifs uid=[your ubuntu user id],gid=[your ubuntu user group id],credentials=/home/[your ubuntu user name]/.smbcredentials,iocharset=utf8,sec=ntlm,noserverino 0 0

Save the file and,

**** in unbutun 18.04.

//10.54.128.19/folder$ /home/[your ubuntu user name]/RND-tool cifs uid=[your ubuntu user id],gid=[your ubuntu user group id],credentials=/home/[your ubuntu user name]/.smbcredentials ,iocharset=utf8 0 0

Restart Ubuntu to test R disk if works.

4)      ~$ sudo mount –a

If the last step is failed, don’t worry, just reboot system, and then it will works if previous operations are correct. Now you can access network disk.

Note: mount -a is to mount all stuff from /etc/fstab

This command can be tested in terminal before fstab.

sudo mount //10.54.128.19/folder$ /home/[your ubuntu user name]/RND-tool -t cifs -o uid=[your ubuntu user id],gid=[your ubuntu user group id],credentials=/home/[your ubuntu user name]/.smbcredentials ,iocharset=utf8

sudo umount RND-tool

#Shell file Error

Syntax error: end of file unexpected (expecting "then")
The problem is the shell file is windows format, so cover to unix format.

#Find the location of program

which xxx

dpkg -listfiles xxx

#type to know the command

type -a xx

examples:

type -a ls

type -a cd

cd is a shell buildin

#Show system information

uname -a, will show all information of system

#file redirection

">" is the output redirection in linux command

e.g. ls -l >abc.txt, the ls output will be in abc.txt, the abc.txt will be overried.

e.g. ls -l >>abc.txt same as before but the abc.txt will not be overrided.

e.g. ls -l >abc.txt 2>&1, here 2 is stderr, redirect the stderr to abc.txt

also "<" is input redirection.

#get the last command return value

echo $?

#ipcs/ipcrm

ipcs lists the system interprocess communication, incl. share memory, queue, semphore.

ipcrm remove a IPC e.g. share memory .

#mount

mount [-t vfstype] [-o options] device directory

e.g. mount -t ext4 /dev/mmcblk0p1 /mnt

#chmod

e.g. chmod 777 abc  7 = 4+2+1

#Change password

• Open the terminal application by pressing Ctrl + Alt + T
• To change a password for user named tom in Ubuntu, type:
• sudo passwd tom
• To change a password for root user on Ubuntu Linux, run:
• sudo passwd root
• And to change your own password for Ubuntu, execute:
• passwd