kll -l command to view all signals
Some of the most commonly used signal values are as follows
#! /bin/bash
trap’echo “good”‘ 2 Here you can use numeric numbers, signal names or abbreviations
sleep 100 When the above script is running, if We a
The UNIX operating system (Eunice) is a powerful multi-user, multi-tasking operating system that supports multiple processor architectures. According to the classification of the operating system, it is a time-sharing operating system. It was first developed by KenThompson, Dennis Ritchie and Douglas McIlroy in 1969 Developed in AT&T’s Bell Labs in the year. At present, its trademark rights are owned by the International Open Standards Organization, and only UNIX systems that conform to a single UNIX specification can use the name UNIX, otherwise it can only be called UNIX-like (UNIX-like)
kll -l command to view all signals
Some of the most commonly used signal values are as follows
#! /bin/bash
trap’echo “good”‘ 2 Here you can use numeric numbers, signal names or abbreviations
sleep 100 When the above script is running, if We a
Shell script printing isosceles triangle #!/bin/bash
for ((i=1;i<= 9;i++))
do
for ((j=9;j>=i;j- -))
do
echo -n ” ”
done
for ((j=2;j<= i;j++)) do echo -n "*" done for ((j=1
Interactive input and for statement (8-15)
Interactive input
1, read Usage: The read command can define multiple variable values at the same time, and the input content can be used as
The shell script prints a right-angled triangle #! /bin/ bash
for ((i=1;i<= 9;i++)) do for ((j=1;j<=$i;j++ )) do echo -n "*" done echo done
#! /bin/bash
for ((i=1;i<= 9;i++)) do for ((j=1;j<=$i;j++ )) do echo -n "*" done echo done
The main configuration file: /etc/dhcp/dhcpd.conf is almost empty
Reference template: /usr/share/doc/dhcp-4.2.5/dhcpd.conf .sample
IP information and related lease information: /var/lib/dhcpd/dhcpd
I have a huge text file. I want to extract the first 532541 lines of it and store them in another file. Selecting the text with the mouse and executing ctrl c is obviously not a feasible Solution.<
Problem There are N stones in a pile. A and B take turns to take, A takes first. The minimum amount taken each time is 1, and the maximum shall not exceed twice the amount taken by the opponent las
Given an absolute path for a file (Unix-style), simplify it. Or in other words, convert it to the canonical path.
In a UNIX-style file system, a period . refers to the current directory. Furt
There are three swordsmen of text processing under Linux – grep sed awk
grep: text line filter tool
sed: text line editor (stream editor)< /p> awk: report generator (formatting text ou
The production of images started by abnormal applications is actually to make some program images that are not installed by rpm by default.
At present, many on the market are started from jar packa