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In some embedded systems, users only use the ps provided by the busybox. But the ps provided by the busybox does not support the -eo option by default. As a result, an error is reported when the userdel is used. So add a judgment on ps. If there is no ps -eo, traverse the process directly. The error information is as follows: # userdel xsl ps: invalid option -- 'e' Signed-off-by: xiongshenglan <xiongshenglan@huawei.com>