如何使用bash从txt文件的开头删除字符？

Question

我有一些txt文件，如下所示：

data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/2wBDAQMDAwQDBAgEBBAQEBAQEBAQEBAQEBAQEBAQEBD/wAARCAUAAtADASIAAhEBAxEB/8QAHQAAAgIDAQEBAAAAAAAAAAAAAwQCBQEGBwgACf/EAFAQAAIBAwMCBAQEBAMHAQUBEQECAwAEEQUSIQYxEyJBUQcUYXEIMoGRFSNCoVKxwQACAwEBAQAAAAAAAAAAAAABAgADBAUGB//EADkRAAICAgIBAgUBBwIFBAMAAAABAhEDIRIxBCJBBRMyUWFxFCOBkaGx0TPBJEJS4fAGFTSSQ3KC/9oADAMBAAIRAxEAPwD8+4YcMMjIBoqXkcTEAkkcDB709Bp9tpQ/Y9xScplulJXkZwAO1bD/ALm3lvAJbiI/zAMKOcfpU 

我想在脚本中添加一些命令来删除：

data:image/jpeg;base64,

并获得以下效果：

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

我尝试使用一些sed命令，但没有用，而且我没有更多的主意。

Answer 1

您可能忘了跳过反斜杠。再试一次：

sed 's/data:image\/jpeg;base64,//' file > newFile

Answer 2

如果要处理包含/的文本输入，则可以在#内使用@或sed等不同的分隔符。

sed 's#data:image/jpeg;base64,##' file

或此文件以替换文件中的内容。

sed  -i 's#data:image/jpeg;base64,##' file