devops based on go
Home page:
Tail page:
Config page:
$ ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
timothy 29217 0.0 0.0 11916 4560 pts/21 S+ 08:15 0:00 pine
root 29505 0.0 0.0 38196 2728 ? Ss Mar07 0:00 sshd: can [priv]
can 29529 0.0 0.0 38332 1904 ? S Mar07 0:00 sshd: can@notty
ps aux|head -1
# Returns: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
#ps aux with ppid
ps axo user,pid,ppid,pcpu,pmem,vsz,rss,tname,stat,start,time,args|head -1
# Returns: USER PID PPID %CPU %MEM VSZ RSS TTY STAT STARTED TIME COMMAND
# Getting rid of the headers
ps aux --no-heading
# Sorting by pid desc
ps aux --sort=-pid
# Show with parent/child process tree
ps auxf
Sample Output
root 3279 0.0 0.3 4544 1056 ? Ss Feb01 0:00 /usr/sbin/sshd
root 4029 0.0 0.6 8596 2004 ? Ss Feb01 0:00 \_ sshd: svcsuprt [priv]
svcsuprt 4032 0.1 0.5 8972 1900 ? S Feb01 7:14 | \_ sshd: svcsuprt@pts/0
svcsuprt 4033 0.0 0.4 6504 1472 pts/0 Ss Feb01 0:00 | \_ -bash
svcsuprt 29013 0.0 0.2 2488 768 pts/0 R+ 12:04 0:00 | \_ ps auxf
# ps -aef --forest
root 114032 1170 0 Apr05 ? 00:00:00 \_ sshd: root@pts/4
root 114039 114032 0 Apr05 pts/4 00:00:00 | \_ -bash
root 56225 114039 0 13:47 pts/4 00:00:16 | \_ top
root 114034 1170 0 Apr05 ? 00:00:00 \_ sshd: root@notty
root 114036 114034 0 Apr05 ? 00:00:00 | \_ /usr/libexec/openssh/sftp-server
root 103102 1170 0 Apr06 ? 00:00:03 \_ sshd: root@pts/0
root 103155 103102 0 Apr06 pts/0 00:00:00 | \_ -bash
root 106798 103155 0 Apr06 pts/0 00:00:00 | \_ su - postgres
postgres 106799 106798 0 Apr06 pts/0 00:00:00 | \_ -bash
postgres 60959 106799 0 14:39 pts/0 00:00:00 | \_ ps -aef --forest
postgres 60960 106799 0 14:39 pts/0 00:00:00 | \_ more
USER = user owning the process
PID = process ID of the process
%CPU = It is the CPU time used divided by the time the process has been running.
%MEM = ratio of the process’s resident set size to the physical memory on the machine
VSZ = virtual memory usage of entire process (in KiB)
RSS = resident set size, the non-swapped physical memory that a task has used (in KiB)
TTY = controlling tty (terminal)
STAT = multi-character process state
START = starting time or date of the process
TIME = cumulative CPU time
COMMAND = command with all its arguments
Process state codes:
R running or runnable (on run queue)
D uninterruptible sleep (usually IO)
S interruptible sleep (waiting for an event to complete)
Z defunct/zombie, terminated but not reaped by its parent
T stopped, either by a job control signal or because it is being traced
Some extra modifiers:
< high-priority (not nice to other users)
N low-priority (nice to other users)
L has pages locked into memory (for real-time and custom IO)
s is a session leader
l is multi-threaded (using CLONE_THREAD, like NPTL pthreads do)
+ is in the foreground process group
#!/bin/bash
START=$(date +%s)
awk 'substr($0,1,19)>="2018-01-04 16:07:18" && substr($0,1,19)<="2018-01-04 16:07:19"' < src.log > cut.log
END=$(date +%s)
DIFF=$(( $END - $START ))
echo "It took $DIFF seconds"
[yogaapp@host1 ~]$ ssh-keygen -t rsa
[yogaapp@host1 ~]$ ssh-copy-id -i .ssh/id_rsa.pub cpapp@host2Go program os.Getenv("PATH") print PATH: /usr/local/bin:/bin:/usr/bin, So we need link java executable to /usr/bin or /usr/local/bin.
[root@hitest.app.02 ~]# which java
/opt/jdk1.8.0_20/bin/java
[root@hitest.app.02 ~]# ln -s /opt/jdk1.8.0_20/bin/java /usr/bin/java
[root@hitest.app.02 ~]# ls -l /usr/bin/java
lrwxrwxrwx 1 root root 25 Jan 10 10:56 /usr/bin/java -> /opt/jdk1.8.0_20/bin/java +-permissions that apply to the owner
|
| +-permissions that apply to all other users
| |
| | +-number of hard links
| | |
| | | +-size +-last modification date and time
_|_ _|_ | _|__ ________|_______
drwxr-xr-x 2 ataka root 4096 2008-11-04 16:58 ataka
___ _____ ____ _____
| | | |
| | | +-name of file or directory
| | |
| | +-the group that the group permissions applies to
| |
| +-owner
|
+-permissions that apply to users who are members of the group
# -h或–human-readable 以K，M，G为单位，提高信息的可读性。
du -h --max-depth=1#!/bin/bash
logfile=$1
# truncate a log-file at 50000 lines.
if [ -f ${logfile} ]
then
ls -lh ${logfile}
tail -50000 $logfile > $logfile.tmp
cat $logfile.tmp > $logfile
rm $logfile.tmp
ls -lh ${logfile}
else
echo "File $logfile not found"
fi#!/bin/awk -f
BEGIN {
phead = 1 # head of previous lines queue
ptail = 1 # size of previous lines queue
pmax = 3 # max size of previous lines queue
found = 0 # found lines from keyword
max = 2 # max lines from keyword
}
{
if (found == 0) {
if ($0 ~ /7/) {
found = 1
for(key in parr) print parr[key]
print
} else {
parr[ptail++] = $0
if(ptail - phead > pmax) delete parr[phead++]
}
} else {
print
if(++found == max) exit
}
}
END {
}
# n for numeric sorting, r for reverse order and k 2,2 for the second column.
ps aux | sort -nrk 3,3 | head -n 5
# If you want something that's truly 'top'esq with constant updates, use watch
watch "ps aux | sort -nrk 3,3 | head -n 5"0 0 8-20 * * ?
A cron expression represents a set of times, using 6 space-separated fields.
| Field name | Mandatory? | Allowed values | Allowed special characters |
|---|---|---|---|
| Seconds | Yes | 0-59 | * / , - |
| Minutes | Yes | 0-59 | * / , - |
| Hours | Yes | 0-23 | * / , - |
| Day of month | Yes | 1-31 | * / , - ? |
| Month | Yes | 1-12 or JAN-DEC | * / , - |
| Day of week | Yes | 0-6 or SUN-SAT | * / , - ? |
You may use one of several pre-defined schedules in place of a cron expression.
| Entry | Description | Equivalent To |
|---|---|---|
| @yearly (or @annually) | Run once a year, midnight, Jan. 1st | 0 0 0 1 1 * |
| @monthly | Run once a month, midnight, first of month | 0 0 0 1 * * |
| @weekly | Run once a week, midnight between Sat/Sun | 0 0 0 * * 0 |
| @daily (or @midnight) | Run once a day, midnight | 0 0 0 * * * |
| @hourly | Run once an hour, beginning of hour | 0 0 * * * * |
You may also schedule a job to execute at fixed intervals, starting at the time it's added or cron is run. This is supported by formatting the cron spec like this:
@every <duration>
where "duration" is a string accepted by time.ParseDuration.
A duration string is a possibly signed sequence of decimal numbers, each with optional fraction and a unit suffix, such as "300ms", "-1.5h" or "2h45m". Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
For example, "@every 1h30m10s" would indicate a schedule that activates after 1 hour, 30 minutes, 10 seconds, and then every interval after that.
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