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Bash if statement with multiple conditions throws an error
...ks whether the specified variables were set.
As the script shows, you can pipe them with -a, e.g.:
if [ -z "$MYSQL_ROOT_PASSWORD" -a -z "$MYSQL_ALLOW_EMPTY_PASSWORD" -a -z "$MYSQL_RANDOM_ROOT_PASSWORD" ]; then
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fi
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ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C++内核技术
...立执行部分，这样它们运行在两个盒子上： 这样的设计无法满足可扩展性测试。当两个盒子不能处理负载时，在不重写应用的情况下，没有办法增加第三个盒子。 注意：ØMQ里的模式是由一对套接字来表示的。 非可...
How do you get the list of targets in a makefile?
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Running make list then prints all targets, each on its own line; you can pipe to xargs to create a space-separated list instead.
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How to hide command output in Bash
...have almost exactly the same way, except that unless you involve them in a pipe the braces will not create a subshell and thus will allow you to set variables inside.
{
/your/first/command
/your/second/command
} &> /dev/null
See the bash manual on redirections for more details, options...
What is time_t ultimately a typedef to?
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No need for the pipe from echo either: gcc -E -xc -include time.h /dev/null | grep time_t
– rvighne
Nov 25 '19 at 18:58
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How should I escape commas and speech marks in CSV files so they work in Excel?
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Even after double quotes, I had this problem for a few days.
Replaced Pipe Delimiter with Comma, then things worked fine.
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How to generate an openSSL key using a passphrase from the command line?
...t:
openssl genrsa -aes128 -passout stdin 3072
You can also used a named pipe with the file: option, or a file descriptor.
To then obtain the matching public key, you need to use openssl rsa, supplying the same passphrase with the -passin parameter as was used to encrypt the private key:
opens...
Aliases in Windows command prompt
...ne. They can't be used generically as commands, e.g. not in batch files or piped into.
– Eryk Sun
Aug 2 '15 at 9:31
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How to find the nearest parent of a Git branch?
Let's say I have the following local repository with a commit tree like this:
20 Answers
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Is there a way of having git show lines added, lines changed and lines removed?
... broken down by file. To see the total added/removed for the diff, you can pipe it to awk: git diff --numstat | awk '{ added += $1; removed += $2 } END { print "+" added " -" removed }'
– hughes
Dec 1 '15 at 2:49
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