Vim commands Collection

Command History

 To: and / beginning commands have history, you can type the first: or / and then press the down arrow to select a command history.

Start vim

Enter the following command in the command line window to

    [root@mylab]# vim

vim filename open vim or create a file named filename

    [root@mylab ...

Redis 3.0.5 on the Linux installation and configuration

1. Download the installation package

[root@mylab]# wget http://download.redis.io/releases/redis-3.0.5.tar.gz

2. Compilation and installation

[root@mylab]# yum install gcc tcl
[root@mylab]# tar -zxf redis-3.0.5.tar.gz
[root@mylab]# cd redis-3.0.5
[root@mylab ...

centos7 switch graphic mode and text mode

In the graphic mode using ctrl + alt + F2 to switch to a text mode.
text mode press ctrl + alt + F2 to switch back to the graphic mode.
Enter the command init 3 to switch to text mode.
Enter the command init 5 to switch to graphic mode.

If ...

linux IO redirection

The default output device: standard output, STDOUT, 1

Default input device: standard input, STDIN, 0

Standard error output: STDERR, 2

Linux I/O redirection:

>: Override Output

eg. [root@mylab]# ls /var > /tmp/var2.out

>>: Append output

set -C: already prohibits the use of file redirection coverage

Force overwrite output ...

linux bash shell command aliases Command substitution globbing

1.bash shell command aliases:

##### alias CMDALIAS = 'COMMAND [options] [arguments]'
##### Shell aliases defined only valid in the current shell life cycle; effective range of only the current    shell process alias:
 eg. [root@levi ~]# alias cls=clear

Cancel command aliases:

[root@levi ~]#unalias CMDALIAS

the same alias command ...

Linux help command : help,--help,man,info

type command : View command type(Internal Command,External Command)

eg.:
[root@levi ~]# type -a cd 
cd is a shell builtin (Internal Command)

[root@levi ~]# type -a grep 
 grep is /bin/grep    ( External Command)

1.Internal Command (Help view)

help COMMAND

2.External Command (help view)

COMMAND --help

3 ...

linux sh script exception /bin/sh^M:bad interpreter: No such file or directory

reason : This is caused by a different system encoding formats.

resolve : 1.Conversion at windows

        Use UltraEdit or EditPlus

        UltraEdit: File-->Conversions-->DOS-->UNIX

        EditPlus : Edit-->EOL Conversions-->Convert to UNIX Format


        2.Conversion with vi

        >vi filename

        :set ff or :set fileformat

        You can see ...

makefile

.SUFFIXES:.c .o    
CC=gcc
SRCS=filerw.c

OBJS=$(SRCS:.c=.o)
EXEC=demo


start: $(OBJS)
    $(CC) -o $(EXEC) $(OBJS)
    @echo '@_@@_@@_@@_@@_@@_@@_@@_@  ok  @_@@_@@_@@_@@_@@_@@_@@_@'

.c.o:
    $(CC) -Wall -g -o $@ -c $<

clean:
    rm -f $(OBJS)

linux c library function to read binary file code

struct person
{
    int id;
    char name[20];
    int age;
    int sex;
    char tel[20];
};


int main(int arg, char *args[])
{
    FILE *p = fopen(args[1], "w");
    if (p == NULL)
    {
        printf("error is %s\n", strerror(errno));
    } else
    {
        printf("success\n");
        struct person man;
        memset(&man, 0 ...

read dir code

int main(int arg, char *args[])
{
    if (arg <2)
        return 0;

    DIR *dp;
    struct dirent *dirp;
    dp = opendir(args[1]);
    if (dp == NULL)
    {
        printf("error is %s\n", strerror(errno));
        return 0;
    }

    while((dirp = readdir(dp)) != NULL)
    {
        printf("%s\n", dirp->d_name);

    }

    closedir(dp);

    return 0;
}