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linux:bash:start [2026/06/11 14:15] – titannetlinux:bash:start [2026/06/11 16:11] (current) – titannet
Line 6: Line 6:
 | ''%%>>%%'' | append to existing file | | ''%%>>%%'' | append to existing file |
 | ''%%|%%'' | pipe output | | ''%%|%%'' | pipe output |
 +
 +| ''diff'' | show differences |
 +
 +====== Headline ======
 +
 +| ''tar -tvf'' | List with details |
 +| ''tar czf data.tar.gz <folder/files>'' | compress file |
 +| ''tar -cjf archive.tar.bz2 <folder/files>'' | compress with bzip2 |
 +| ''tar -xzf data.tar.gz'' | decompress file | 
 +| ''tar -rvf archive.tar newfile'' | append to file |
 +
 +
  
 ====== Terminal Shortcuts ====== ====== Terminal Shortcuts ======
Line 35: Line 47:
 | ''awk'' | don't ask | | ''awk'' | don't ask |
 | ''sed'' | replace characters in file | | ''sed'' | replace characters in file |
-| ''jq'' | filter json |+| ''jq'', ''jq .'' | filter json | 
 + 
 +===== Search ===== 
 + 
 + 
 +===== Others ===== 
 + 
 +| ''%%echo 'ABC=' | base64 -d%%'' | decode base64 | 
 +| ''md5sum <file>'', ''sha256sum <file>'' | create checksum | 
 + 
 +| visidata | search tabular/log files | 
 + 
 + 
 + 
 +===== Log analysis =====
  
 +<source bash>
 +<nowiki>
 +sudo awk '{print $1" "$2" "$3, $4, $5, substr($0, index($0,$6))}' /var/log/auth.log | jq -R -c 'split(" ") | {timestamp: (.[0]+" "+.[1]+" "+.[2]), hostname: .[3], process: .[4], message: .[5:] | join(" ")}' > auth.json
 +</nowiki>
 +</source>