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| 1 | + | # sed | |
| 2 | + | ||
| 3 | + | * insert a line at the start of a file: | |
| 4 | + | ||
| 5 | + | sed -i '1s/^/your text\\n/' file | |
| 6 | + | ||
| 7 | + | * replace newline char: | |
| 8 | + | ||
| 9 | + | sed ':a;N;$!ba;s/\\n/NEWCHAR/g' filename | |
| 10 | + | ||
| 11 | + | * remove two adjacent lines (`N;` joins each line to the following line): | |
| 12 | + | ||
| 13 | + | sed 'N;s/line 1\\nline 2/replacement/g' filename | |
| 14 | + | ||
| 15 | + | * cut file between lines: | |
| 16 | + | ||
| 17 | + | `sed -n '3598627,3607135p' /var/log/syslog` | |
| 18 | + | ||
| 19 | + | * insert a hash at the start of every line: | |
| 20 | + | ||
| 21 | + | `sed 's/^/#/' file.txt` | |
| 22 | + | ||
| 23 | + | * and then remove the hash: | |
| 24 | + | ||
| 25 | + | `sed 's/^#//g' file.txt` | |
| 26 | + | ||
| 27 | + | * insert a line after a match: | |
| 28 | + | ||
| 29 | + | `sed -i '/string_to_match.*/a string_to_insert' /file` | |
| 30 | + | ||
| 31 | + | * match pattern and print including trailing three lines: | |
| 32 | + | ||
| 33 | + | `sed -n '/somestring/,+3 p' filename` | |
| 34 | + | ||
| 35 | + | * match pattern and delete including trailing three lines: | |
| 36 | + | ||
| 37 | + | `sed '/somestring/,+3 d' filename` | |
simon revised this gist 1 month ago · 4cd1b2c
1 file changed, 37 insertions