Insert digits into match - sed command help - Linux Programming & Scripting - Linux Config Forum
Sed Command Cheat Sheet & Quick Reference
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Your Own Linux
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12 Useful 'sed' Commands In Linux | LinuxTeck
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sed - Wikipedia
text processing - How to add 12spaces to the next line after the string match in shell? - Unix & Linux Stack Exchange
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Print Lines Starting with String in Linux - GeeksforGeeks
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