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linux:bash:start [2026/06/11 14:14] – 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 ====== ====== Terminal Shortcuts ======
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 ===== Background processes ===== ===== Background processes =====
  
-| jobs | list jobs | +| ''jobs'' | list jobs | 
-| fg %# | move to foreground | +| ''fg %#'' | move to foreground | 
-| bg | continue in background | +| ''bg'' | continue in background | 
-| kill %# or kill <pid> | kill process | +| ''kill %#'' or ''kill <pid>'' | kill process | 
-| kill -9 .. | terminate |+| ''kill -9 ..'' | terminate |
  
  
 ===== Filtering ===== ===== Filtering =====
  
-| grep | Find strings in files | +| ''grep'' | Find strings in files | 
-| sort | Sort file |+| ''sort'' | Sort file |
 | ''%%sort | uniq%%'', ''sort -u'' | Sort & remove duplicates | | ''%%sort | uniq%%'', ''sort -u'' | Sort & remove duplicates |
-| wc | word count | +| ''wc'' | word count | 
-| 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>