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解决xrdp登陆一直黑屏的问题：显示通道被占用 - 操作系统(内核) - 清泛网 -...
...建议安装多款远程桌面工具。
记录一下调查步骤：
cat /var/log/xrdp-sesman.log #发现显示通道204启动超时，其他Xserver可能已占用该通道
ps -elf|grep vnc
kill {PID of vnc}
通道启动超时的日志如下：
[ERROR] X server for display 204 startup t...
How to apply shell command to each line of a command output?
... to append a random ID between 1000 and 15000, when SED matches a line. cat /logs/lfa/Modified.trace.log.20150904.pw | sed -r 's/^(.*)(\|006\|00032\|)(.*)$/echo "\1\2\3 - ID `shuf -i 999-14999 -n 1`"/e'
– sgsi
Sep 8 '15 at 21:37
...
Bash ignoring error for a particular command
...
The solution:
particular_script || true
Example:
$ cat /tmp/1.sh
particular_script()
{
false
}
set -e
echo one
particular_script || true
echo two
particular_script
echo three
$ bash /tmp/1.sh
one
two
three will be never printed.
Also, I want to add that when pipefai...
Checking if a string array contains a value, and if so, getting its position
...accepted answer because it allows one to pass in a lambda to do more complicated things like Array.FindIndex(array, x => x.StartsWith("insert string here"))
– reggaeguitar
Apr 2 '14 at 21:33
...
How to check the version of GitLab?
...
cd /opt/gitlab
cat version-manifest.txt
Example:
gitlab-ctl 6.8.2-omnibus
gitlab-rails v6.8.2
Current gitlab version is 6.8.2
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Convert array of strings into a string in Java
...
From Java 8, the simplest way I think is:
String[] array = { "cat", "mouse" };
String delimiter = "";
String result = String.join(delimiter, array);
This way you can choose an arbitrary delimiter.
shar...
Count occurrences of a char in a string using Bash
...rs.
Multiple lines of input are also good for this solution, like command cat mytext.txt | tr -cd 'e' | wc -c can counts e in the file mytext.txt, even thought the file may contain many lines.
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Getting the last argument passed to a shell script
...=$BASH_ARGV # official built-in (but takes more typing :)
That's it.
$ cat lastarg
#!/bin/bash
# echo the last arg given:
_last=${!#}
echo $_last
_last=$BASH_ARGV
echo $_last
for x; do
echo $x
done
Output is:
$ lastarg 1 2 3 4 "5 6 7"
5 6 7
5 6 7
1
2
3
4
5 6 7
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Using Python String Formatting with Lists
... need to write out a formatted string. The following doesn't work, but indicates what I'm trying to do. In this example, there are three %s tokens and the list has three entries.
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How do I pass multiple attributes into an Angular.js attribute directive?
...wered Mar 16 '17 at 17:35
Ilker CatIlker Cat
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