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Linux常用命令-75：ulimit
source link: https://xugaoxiang.com/2022/06/23/linux-cmds-75-ulimit/
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Linux 对于每个用户，系统可以限制其使用的最大进程数，这个命令就是 ulimit。
语法格式：ulimit [参数]
常用参数：
# 显示当前系统的设置
ulimit -a
# 设置每个进程可以打开的文件句柄数
ulimit -n 4096Recommend
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