Linux x memo

command

echo Display a character string on the screen

Add to file with echo command $ echo Character string to be added >> File name

Output to a newly created file with the echo command $ echo string> filename

In case of double quotation mark "" ", the variable is expanded and displayed. $ echo "$DIR"

grep Search for strings in files grep {search regular expression} {filename}

-n Show line number grep -n "10-16 10:" system.log

less Display text files one screen at a time

• Number of lines Display from the specified line
• / Character string Searches for the specified character string and displays it from the found line. -N Show line number ex) less +80000 -N system.log ex) less +/"10-16 16" -N system.log

head Output the first few lines of the log file and check the contents -n {number}: Specify the number of lines ex) head -n 1 system.log

cut Extract only the required fields -f Select field ex) To specify a third field -f3 -d Specify delimiter ex), -d for delimiter, ex) cut -d " " -f1 system.log ex) cut -d " " -f1 system.log | tail -200f

wc Count the number of lines, words, and bytes ex) wc system.log -> 99872 1233964 18467421 system.log Number of lines, number of words, number of bytes

find Get a list of files that contain the character string "○○" in the file name. ls [path of search target folder] | grep" [character string you want to search] "

A list of files that contain the string "○○" in the contents of the opened file. find [path of search target folder] -type f -print | xargs grep'[character string you want to search]' -type f Specify the type to search. Since the left is "f", normal files are targeted -print Standard output of search results

mkdir mkdir `date .+%Y'` mkdir `date '+%Y'`/`date '+%m%d'` -> System current date and time can be specified in the directory name

ps Check the process ps -ef | grep java -e Show all processes -f Show processes hierarchically

Get a list of files that contain the character string "○○" in the file name. ls [path of search target folder] | grep" [character string you want to search] "

find Search file You can use the -name wildcard to search by specifying only part of a file or directory name. -type f Search only for files. -type d Search for directories.

Search in file : / {Search string}

scp Basic usage

scp [option]Copy source Copy destination

option -r Recursively copy in directory -p Keep original file update time and mode

When specifying another remote server

account name@hostname:directory

Example: Move from 192.168.10.1 server to local ~ / tmp

scp [email protected]:/home/user/file1 ~/tmp

curl GET

curl {Host}

# +params
curl {Host}?{name}={value}&{name}={value}

POST

curl -X POST {Host}

# +params
curl -X POST {Host} -d {name}={value}&{name}={value}

Output HTTP header

#Include HTTP headers in output
curl -i {Host}
#Get only HTTP headers
curl -I {Host}

Specify request header

curl -H "key:value"

#Multiple designation
curl -H "key:value" -H "key:value"
e.g. curl -X POST -H "Content-Type: application/json" -d '{"name":"tanaka"}' https://xxxxx

Display request headers and response headers

curl -v {Host}

Specify user agent

curl -A {User agent} {Host}
curl -H "User-Agent: xxx" {Host}

Use of proxy server

curl -x proxy server:port number{Host}

#If authentication is required
curl -x proxy server:port number--proxy-user username:Password http://Target URL

Line breaks (not limited to curl)

\
e.g.
curl -s -X POST {url} \
    -H "accept: application/json" \
    -H "toke: *****"

reference

other

Bash settings are required when using non-Linux commands Need to add settings to /home/jlguser/.bashrc Example) payara

export PAYARA_BIN=/usr/local/payara/glassfish/bin
export PATH=$PAYARA_BIN:$PATH

Example) java

export JAVA_HOME=/usr/local/jdk1.8
export PATH=$JAVA_HOME/bin:$PATH

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