source /etc/profile? 出現

bash:PROMPT-COMMAND: 只讀變量

利用unset命令是無法刪除只讀變量的

如果你linux中沒有gdb命令的話，下載一下

sudo yum install gdb

下載好之后

先按照下面的方法試驗一下

# readonly test=1

# test=2

bash: test: 只讀變量

# cat << EOF| gdb

> attach $$

> call unbind_variable("test")

> detach

> EOF

GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-110.el7

Copyright (C) 2013 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law. Type "show copying"

and "show warranty" for details.

This GDB was configured as "x86_64-redhat-linux-gnu".

For bug reporting instructions, please see:

.

(gdb) Attaching to process 12409

Reading symbols from /usr/bin/bash...Reading symbols from /usr/bin/bash...(no debugging symbols found)...done.

(no debugging symbols found)...done.

Reading symbols from /lib64/libtinfo.so.5...Reading symbols from /lib64/libtinfo.so.5...(no debugging symbols found)...done.

(no debugging symbols found)...done.

Loaded symbols for /lib64/libtinfo.so.5

Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.

Loaded symbols for /lib64/libdl.so.2

Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.

Loaded symbols for /lib64/libc.so.6

Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.

Loaded symbols for /lib64/ld-linux-x86-64.so.2

Reading symbols from /lib64/libnss_files.so.2...(no debugging symbols found)...done.

Loaded symbols for /lib64/libnss_files.so.2

0x00007fd4b11db17c in waitpid () from /lib64/libc.so.6

Missing separate debuginfos, use: debuginfo-install bash-4.2.46-30.el7.x86_64

(gdb) $1 = 0

(gdb) Detaching from program: /usr/bin/bash, process 12409

(gdb) quit

然后

test=3

發現沒顯示只讀變量提示，說明已經改好了

那么現在修改PROMPT-COMMAND只讀變量屬性

# cat << EOF| gdb

> attach $$

> call unbind_variable("PROMPT-COMMAND")

> detach

> EOF

GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-110.el7

Copyright (C) 2013 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law. Type "show copying"

and "show warranty" for details.

This GDB was configured as "x86_64-redhat-linux-gnu".

For bug reporting instructions, please see:

.

(gdb) Attaching to process 12409

Reading symbols from /usr/bin/bash...Reading symbols from /usr/bin/bash...(no debugging symbols found)...done.

(no debugging symbols found)...done.

Reading symbols from /lib64/libtinfo.so.5...Reading symbols from /lib64/libtinfo.so.5...(no debugging symbols found)...done.

(no debugging symbols found)...done.

Loaded symbols for /lib64/libtinfo.so.5

Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.

Loaded symbols for /lib64/libdl.so.2

Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.

Loaded symbols for /lib64/libc.so.6

Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.

Loaded symbols for /lib64/ld-linux-x86-64.so.2

Reading symbols from /lib64/libnss_files.so.2...(no debugging symbols found)...done.

Loaded symbols for /lib64/libnss_files.so.2

0x00007fd4b11db17c in waitpid () from /lib64/libc.so.6

Missing separate debuginfos, use: debuginfo-install bash-4.2.46-30.el7.x86_64

(gdb) $1 = 0

(gdb) Detaching from program: /usr/bin/bash, process 12409

(gdb) quit

重新運行一下

source /etc/profile

成功

參考??https://blog.csdn.net/weixin_43634280/article/details/84348180

與50位技術專家面對面20年技術見證，附贈技術全景圖

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