linux list cron jobs

number of rows owned by each file;(3) A summary of the total number of documents for several statistics of their lines;8. Write a script(1) Pass more than two strings as user name;(2) Create these users, and the password with the user name;(3) A summary of the total creation of a number of users;9, write a script, create a new 20 users, visitor1-visitor20; calculate the sum of their IDs;10. Write a script that counts the sum of the number of lines starting with # in/etc/rc.d/rc.sysinit,/etc/rc.

/systemdate Add:>> means append (for scenario: copying the contents of one file to the end of another)> means redirect, overwriting the contents of the original file.　　　　Note: To modify mycron.sh to execute the file　 chmod 744 mycron.sh Let mycron.sh at least be -rwxr--r-- .1, the following is sai

Slackware(9), add password for Slackware, and require the minimum password age of 3 days, the maximum is 180 days, warning for 3 days;PASSWD-N3-X180-W3 Slackware passwd Slackware(10), add user OpenStack, whose ID number is 3003, the basic group is clouds, the additional group is Peguin and Nova;Useradd-u 3003-g clouds-g Peguin,nova OpenStack(11), add the system user MySQL, request its shell for/sbin/nologin;Useradd-s/sbin/nologin-m MySQL(12), use the echo command, non-interactive add a passwor

Content of this week's job:1. List the user name of all logged-in users on the current system, note: The same user logged in multiple times, only once.[email protected] ~]$ who | Sort |cut-d ""-f1 |uniq-c2. Remove the information about the user who last logged in to the current system.Last |head-n 1|cut-d ""-f1 |id3. Remove the shell that is the user's default shell on the current system.echo $SHELL; env |grep SHELL4, the third field in the/etc/passwd

1. List the user name of all logged-in users on the current system, note: The same user logged in multiple times, only once.[Email protected] desktop]# whoXu Tty5 2016-08-21 23:20Root tty1 2016-08-21 23:12 (: 0)Root pts/0 2016-08-21 23:13 (: 0.0)[Email protected] Desktop]# who | Cut-d '-f1 |sort-uRootXu2. Remove the information about the user who last logged in to the current system.[[Email protected] Desktop]# last | Head-1Xu Tty5 Sun 23:20 still log

Content of this week's job:1, create a 10G partition, and the format of the Ext4 file system;(1) The block size is required to 2048, the reserved space percentage is 2, the volume label is MyData, the default Mount property contains ACLs;[Email protected]:~# FDISK/DEV/SDACommand (M for help): Pdisk/dev/sda:1000.2 GB, 1000204886016 bytes255 heads, Sectors/track, 121601 cylinders, total 1953525168 sectorsUnits = sectors of 1 * MB = bytesSector size (logical/physical): bytes/512 bytesI/O size (mini

Linux signal list, linux signal list In Linux, each signal name starts with a letter SIG, and each signal corresponds to a digital code. In the header file signum. h, these signals are defined as positive integers. Signal name definition path:/usr/include/i386-

The/ect/services file lists the system's detailed servicesRed font for common servicesAcpidThe ACPI (full name Advanced Configuration and Power Interface) service is the power management interface. It is recommended that all notebook users open it. Some servers may not require ACPI. Common operations supported are: "Power switch", "Battery Monitor", "notebook Lid Switch", "Notebook display Brightness", "hibernate", "Hang Up", and so on.Anacron, ATD, CrondThere is a small difference between these

List, numbered 1 ~ The 31 signal is a traditional Unix-supported signal, which is an unreliable signal (non-real-time) numbered 32 ~ The 63 signal was expanded later, called a reliable signal (real-time signal ). The difference between unreliable and reliable signals is that the former does not support queuing and may cause signal loss, while the latter does not. Below we will discuss the signal number smaller than sigrtmin. 1) sighupThis signal is

This article describes the Linux signal list in detail. For more information, see Run the following command to view the list of signals supported by Linux: ~ $ Kill-l1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL5) SIGTRAP 6) SIGABRT 7) SIGBUS 8) SIGFPE9) SIGKILL 10) SIGUSR1 11) SIGSEGV 12) SIGUSR213) SIGPIPE 14) SIGALRM 15)

after this operation, you can compile nohup sigtest 3 and shell, the content is as follows: sigtest in fact, any way to turn the process into an orphan process can be done, including fork's immediate termination of the parent process.2. sigchld SignalAfter a sub-process dies, it sends a sigchld signal to the parent process.When a process calls the exit command to end its own life, it is not actually destroyed, but it leaves a data structure called Zombie (the system calls exit, it is used to

Execute the kill-l command in the terminal to see the Linux supported signals. 1) SIGHUP 2) SIGINT 3) Sigquit 4) Sigill 5) SIGTRAP 6) SIGABRT 7) Sigbus 8) SIGFPE 9) SIGKILL) SIGUSR111) SIGSEGV (SIGUSR2) sigpipe) sigalrm M16) Sigstkflt () SIGCHLD) Sigcont SIGSTOP) SIGTSTP21) sigttin) Sigttou (SIGXCPU) SIGXFSZ26) sigvtalrm) sigprof) sigwinch) SIGIO) SIGPWR31 34) Sigrtmin) sigrtmin+1 (sigrtmin+2) sigrtmin+338) sigrtmin+4) sigrtmin+5 (sigrtmin+6) s

Under Linux, each signal's name begins with the character SIG , and each signal corresponds to a digital encoding, which is defined as a positive integer in the header file signum.h . Signal name definition path:/usr/include/i386-linux-gnu/bits/signum.hTo see the correspondence between these signals and encodings, you can use the command:kill-lIn the list, the si

) SIGHUPThis signal is issued at the end of the user terminal connection (normal or abnormal), usually at the end of the control process of the terminal to notify the same session of the various jobs, when they are no longer associated with the control terminal.When you log in to Linux, the system is assigned to a terminal (Session) of the logged-on user. All programs running at this terminal, including the

#encoding: Utf-8#!/usr/local/bin/pythonFrom crontab import crontabImport Sys,reFrom Croniter import CroniterFrom datetime import datetimeImport socketImport FcntlImport structdef get_ip_address (ifname):s = socket.socket (socket.af_inet, socket. SOCK_DGRAM)Return Socket.inet_ntoa (Fcntl.ioctl (S.fileno (),0x8915, # SIOCGIFADDRStruct.pack (' 256s ', ifname[:15])) [20:24])If __name__== ' __main__ ':Cron=crontab (user= ' User0 ')Host=get_ip_address (' et

is that the former does not support queuing and may cause signal loss, while the latter does not. Below we will discuss the signal number smaller than sigrtmin. 1) sighupThis signal is sent at the end of the user terminal connection (normal or abnormal). Generally, when the control process of the terminal ends, it notifies all jobs in the same session, they are no longer associated with control terminals. When you log on to

reliable signals is that the former does not support queuing and may cause signal loss, while the latter does not.Below we will discuss the signal number smaller than SIGRTMIN.1) SIGHUPThis signal is sent at the end of the user terminal connection (normal or abnormal). Generally, when the control process of the terminal ends, it notifies all jobs in the same session, they are no longer associated with control terminals.When you log on to

[-] Console-setup[+] Cron[+] Cups[+] Dbus[+] Exim4[+] Gdm3[ ? ] Hdparm[-] Hostname.sh[ ? ] hwclock.sh[-] Kbd[-] Keyboard-setup[ ? ] Killprocs[ ? ] Kmod[+] MiniSSDPd[-] Motd[ ? ] mountall-bootclean.sh[ ? ] mountall.sh[ ? ] mountdevsubfs.sh[ ? ] mountkernfs.sh[ ? ] mountnfs-bootclean.sh[ ? ] mountnfs.sh[ ? ] Mpt-statusd[ ? ] mtab.sh[+] Network-manager[ ? ] Networking[+] Nfs-common[ ? ] Pppd-dns[-] Procps[+] PulseAudio[ ? ] Rc.local[-] Rmnologin[+] Rpcbi