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[Shell: text/file modification] #grep #tr #sed #awk #cut #sort #sh #chmod
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##### tr (TRANSLATE/DELETE) ##### | |
# tr <pattern-translate-in> <pattern-translate-out> | |
# -d: delete SET1 | |
# -t: truncate SET1 to length of SET2 | |
# -c: compliment SET1 | |
# -s: squeeze the repitition SET1 | |
tr 'a-z' 'A-Z' < <file> # converts input to all caps | |
tr -d ' ' < <file># delete spaces | |
cat <file> | tr -cd [:digit:] # delete all but digits | |
##### cut ##### | |
# -d: delimiter | |
# -f: fields (`-f1-7` or `-f1,3,8`) | |
# -c: chars (`-c1-11,50-`) | |
ls -l | cut -c1-11,50- | |
##### grep (PATTERN SEARCH, REGEX) ##### | |
# --color: colorize the match location | |
# -c: count number of lines that match | |
# -n: line nos. that match | |
# -v: invert match | |
# -i: ignore case | |
# -e: expression (useful for multiple patterns) | |
# -E: extended regex (acts like `egrep`) | |
grep --color -c bash /etc/passwd | |
##### sort ##### | |
# -r: reverse the result of comparisons | |
# -t: delimiter (`,`, `' '`, `:`) | |
# -f: ignore case | |
# -b: ignore leading blanks | |
# -d: dictionary sort | |
# -n: numeric sort | |
# -k: field to sort by | |
# -u: unique | |
sort -t, -k2 -k1n -k3 <file> # sort field2 as primary, field1 numbers as secondary, and field3 as tertiary | |
##### nl (LINE NUMBERS) ##### | |
cat <file> | nl # outputs file contents with line nos. | |
##### chmod (PERMISSIONS) ##### | |
# a: add permissions | |
chmod a+x <file> # add execute permissions to file |
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