📄 busybox.txt
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$ df Filesystem 1k-blocks Used Available Use% Mounted on /dev/sda3 8690864 8553540 137324 98% / /dev/sda1 64216 36364 27852 57% /boot $ df /dev/sda3 Filesystem 1k-blocks Used Available Use% Mounted on /dev/sda3 8690864 8553540 137324 98% / ------------------------------- dirname dirname [FILENAME ...] Strips non-directory suffix from FILENAME Example: $ dirname /tmp/foo /tmp $ dirname /tmp/foo/ /tmp ------------------------------- dmesg dmesg [-c] [-n LEVEL] [-s SIZE] Prints or controls the kernel ring buffer Options: -c Clears the ring buffer's contents after printing -n LEVEL Sets console logging level -s SIZE Use a buffer of size SIZE ------------------------------- dos2unix dos2unix [option] [FILE] Converts FILE from dos format to unix format. When no option is given, the input is converted to the opposite output format. When no file is given, uses stdin for input and stdout for output. Options: -u output will be in UNIX format -d output will be in DOS format ------------------------------- dpkg dpkg -i package_file [-CPru] package_name -i Install the package -C Configure an unpackaged package -P Purge all files of a package -r Remove all but the configuration files for a package -u Unpack a package, but dont configure it ------------------------------- dpkg_deb dpkg_deb [-cefItxX] FILE [argument] Perform actions on debian packages (.debs) Options: -c List contents of filesystem tree -e Extract control files to [argument] directory -f Display control field name starting with [argument] -I Display the control filenamed [argument] -t Extract filesystem tree to stdout in tar format -x Extract packages filesystem tree to directory -X Verbose extract Example: $ dpkg-deb -X ./busybox_0.48-1_i386.deb /tmp ------------------------------- du du [-lsxhmk] [FILE]... Summarizes disk space used for each FILE and/or directory. Disk space is printed in units of 1024 bytes. Options: -l count sizes many times if hard linked -s display only a total for each argument -h print sizes in human readable format (e.g., 1K 243M 2G ) -m print sizes in megabytes -x skip directories on different filesystems -k print sizes in kilobytes(default) Example: $ du 16 ./CVS 12 ./kernel-patches/CVS 80 ./kernel-patches 12 ./tests/CVS 36 ./tests 12 ./scripts/CVS 16 ./scripts 12 ./docs/CVS 104 ./docs 2417 . ------------------------------- dumpkmap dumpkmap > keymap Prints out a binary keyboard translation table to standard output. Example: $ dumpkmap > keymap ------------------------------- dutmp dutmp [FILE] Dump utmp file format (pipe delimited) from FILE or stdin to stdout. (i.e., 'dutmp /var/run/utmp') Example: $ dutmp /var/run/utmp 8|7||si|||0|0|0|955637625|760097|0 2|0|~|~~|reboot||0|0|0|955637625|782235|0 1|20020|~|~~|runlevel||0|0|0|955637625|800089|0 8|125||l4|||0|0|0|955637629|998367|0 6|245|tty1|1|LOGIN||0|0|0|955637630|998974|0 6|246|tty2|2|LOGIN||0|0|0|955637630|999498|0 7|336|pts/0|vt00andersen|andersen|:0.0|0|0|0|955637763|0|0 ------------------------------- echo echo [-neE] [ARG ...] Prints the specified ARGs to stdout Options: -n suppress trailing newline -e interpret backslash-escaped characters (i.e., \t=tab) -E disable interpretation of backslash-escaped characters Example: $ echo "Erik is cool" Erik is cool $ echo -e "Erik\nis\ncool" Erik is cool $ echo "Erik\nis\ncool" Erik\nis\ncool ------------------------------- env env [-iu] [-] [name=value]... [command] Prints the current environment or runs a program after setting up the specified environment. Options: -, -i start with an empty environment -u remove variable from the environment ------------------------------- expr expr EXPRESSION Prints the value of EXPRESSION to standard output. EXPRESSION may be: ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2 ARG1 & ARG2 ARG1 if neither argument is null or 0, otherwise 0 ARG1 < ARG2 ARG1 is less than ARG2 ARG1 <= ARG2 ARG1 is less than or equal to ARG2 ARG1 = ARG2 ARG1 is equal to ARG2 ARG1 != ARG2 ARG1 is unequal to ARG2 ARG1 >= ARG2 ARG1 is greater than or equal to ARG2 ARG1 > ARG2 ARG1 is greater than ARG2 ARG1 + ARG2 arithmetic sum of ARG1 and ARG2 ARG1 - ARG2 arithmetic difference of ARG1 and ARG2 ARG1 * ARG2 arithmetic product of ARG1 and ARG2 ARG1 / ARG2 arithmetic quotient of ARG1 divided by ARG2 ARG1 % ARG2 arithmetic remainder of ARG1 divided by ARG2 STRING : REGEXP anchored pattern match of REGEXP in STRING match STRING REGEXP same as STRING : REGEXP substr STRING POS LENGTH substring of STRING, POS counted from 1 index STRING CHARS index in STRING where any CHARS is found, or 0 length STRING length of STRING quote TOKEN interpret TOKEN as a string, even if it is a keyword like `match' or an operator like `/' ( EXPRESSION ) value of EXPRESSION Beware that many operators need to be escaped or quoted for shells. Comparisons are arithmetic if both ARGs are numbers, else lexicographical. Pattern matches return the string matched between \( and \) or null; if \( and \) are not used, they return the number of characters matched or 0. ------------------------------- false false Return an exit code of FALSE (1). Example: $ false $ echo $? 1 ------------------------------- fbset fbset [options] [mode] Show and modify frame buffer settings Example: $ fbset mode "1024x768-76" # D: 78.653 MHz, H: 59.949 kHz, V: 75.694 Hz geometry 1024 768 1024 768 16 timings 12714 128 32 16 4 128 4 accel false rgba 5/11,6/5,5/0,0/0 endmode ------------------------------- fdflush fdflush DEVICE Forces floppy disk drive to detect disk change ------------------------------- find find [PATH...] [EXPRESSION] Search for files in a directory hierarchy. The default PATH is the current directory; default EXPRESSION is '-print' EXPRESSION may consist of: -follow Dereference symbolic links. -name PATTERN File name (leading directories removed) matches PATTERN. -print Print (default and assumed). -type X Filetype matches X (where X is one of: f,d,l,b,c,...) -perm PERMS Permissions match any of (+NNN); all of (-NNN); or exactly (NNN) -mtime TIME Modified time is greater than (+N); less than (-N); or exactly (N) days -newer FILE Modified time is more recent than FILE's Example: $ find / -name /etc/passwd /etc/passwd ------------------------------- free free Displays the amount of free and used system memory Example: $ free total used free shared buffers Mem: 257628 248724 8904 59644 93124 Swap: 128516 8404 120112 Total: 386144 257128 129016 ------------------------------- freeramdisk freeramdisk DEVICE Frees all memory used by the specified ramdisk. Example: $ freeramdisk /dev/ram2 ------------------------------- fsck_minix fsck_minix [-larvsmf] /dev/name Performs a consistency check for MINIX filesystems. Options: -l Lists all filenames -r Perform interactive repairs -a Perform automatic repairs -v verbose -s Outputs super-block information -m Activates MINIX-like "mode not cleared" warnings -f Force file system check. ------------------------------- getopt getopt [OPTIONS]... Parse command options -a, --alternative Allow long options starting with single - -l, --longoptions=longopts Long options to be recognized -n, --name=progname The name under which errors are reported -o, --options=optstring Short options to be recognized -q, --quiet Disable error reporting by getopt(3) -Q, --quiet-output No normal output -s, --shell=shell Set shell quoting conventions -T, --test Test for getopt(1) version -u, --unqote Do not quote the output Example: $ cat getopt.test #!/bin/sh GETOPT=`getopt -o ab:c:: --long a-long,b-long:,c-long:: \ -n 'example.busybox' -- "$@"` if [ $? != 0 ] ; then exit 1 ; fi eval set -- "$GETOPT" while true ; do case $1 in -a|--a-long) echo "Option a" ; shift ;; -b|--b-long) echo "Option b, argument `$2'" ; shift 2 ;; -c|--c-long) case "$2" in "") echo "Option c, no argument"; shift 2 ;; *) echo "Option c, argument `$2'" ; shift 2 ;; esac ;; --) shift ; break ;; *) echo "Internal error!" ; exit 1 ;;⌨️ 快捷键说明
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