Wenjin Rao fipped

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玩物丧志

fipped / check.go

Created November 14, 2022 18:33 — forked from mattes/check.go

Check if file or directory exists in Golang

	if _, err := os.Stat("/path/to/whatever"); os.IsNotExist(err) {
	// path/to/whatever does not exist
	}

	if _, err := os.Stat("/path/to/whatever"); !os.IsNotExist(err) {
	// path/to/whatever exists
	}

fipped / tail.sh

Created December 1, 2021 07:16

命令行显示文件最新内容

	# 不断显示出文件最新内容
	tail -f xx.log

fipped / trace.py

Created November 1, 2021 03:41

python 打印函数调用堆栈

	import traceback

	def f():
	for line in traceback.format_stack():
	print(line.strip())

fipped / setlocale-problem.sh

Created October 29, 2021 06:33

查看哪个进程的环境变量里含有.utf8

	for i in `ps -ef --no-headers \| awk '{ print $2; }'`; do
	sudo cat /proc/$i/environ \| \
	tr '\0' '\n' \|
	grep '\.utf8$' > /dev/null 2>&1 && echo $i
	done > /tmp/123

	ps -ef \| grep -P "$(tr '\n' '\|' < /tmp/123 \| sed 's/\\|$//')"
	rm /tmp/123

fipped / json.py

Created October 26, 2021 04:12

python json dump用法


	# ensure_ascii 设为假可以打印中文。indent 是缩进
	print(json.dumps(obj, indent=4, ensure_ascii=False))

fipped / gist:579da02bded995a977df98e03c9caf6e

Created October 26, 2021 04:10

shell 脚本用法

XX=${YY:-ZZ} # ZZ 是 YY 没设置时使用的默认值

fipped / sftp.sh

Created February 15, 2021 12:54

File transfer commands：sftp、scp

	sftp [email protected]
	put localpath
	get remotepath

	----


	scp local_file remote_user@host:remote_folder

fipped / output.sh

Created December 16, 2020 09:23

Echo increasing numbers

export i=1; while true; do export i=$((i+1)); echo $i; sleep 1; done;

fipped / Shell

Created December 1, 2020 09:23

Default value in shell

	# 2 means the second argument
	my_variable=${2:-"default value"}

	# Use the second argument, but if none then the first one
	my_another_var=${2:-${1}}

fipped / sed.sh

Created September 23, 2020 02:36

sed 删除带有指定内容的行

sed -e '/指定内容/d' old.log > new.log

	for i in `ps -ef --no-headers \| awk '{ print $2; }'`; do
	sudo cat /proc/$i/environ \| \
	tr '\0' '\n' \|
	grep '\.utf8$' > /dev/null 2>&1 && echo $i
	done > /tmp/123

	ps -ef \| grep -P "$(tr '\n' '\|' < /tmp/123 \| sed 's/\\|$//')"
	rm /tmp/123