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linux:bash:start [2026/06/11 14:00] – created titannetlinux:bash:start [2026/06/11 16:11] (current) – titannet
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 | ''%%>>%%'' | 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 ======
 +
 +CTRL
 +
 +| +a | Go to beginning of commandline | 
 +| +e | Go to end of command line |
 +| +u | Delete to line begin |
 +| +k | Delete to line end |
 +| +c | kill current process |
 +| +z | put current process in background |
 +
 +===== Background processes =====
 +
 +| ''jobs'' | list jobs |
 +| ''fg %#'' | move to foreground |
 +| ''bg'' | continue in background |
 +| ''kill %#'' or ''kill <pid>'' | kill process |
 +| ''kill -9 ..'' | terminate |
 +
 +
 +===== Filtering =====
 +
 +| ''grep'' | Find strings in files |
 +| ''sort'' | Sort file |
 +| ''%%sort | uniq%%'', ''sort -u'' | Sort & remove duplicates |
 +| ''wc'' | word count |
 +| ''awk'' | don't ask |
 +| ''sed'' | replace characters in file |
 +| ''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>
 +
 +