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Merge branch 'master' of https://github.com/chubin/cheat.sheets

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This commit is contained in:
Igor Chubin 2017-12-03 13:05:35 +00:00
commit fbe957f77d
1 changed files with 6 additions and 4 deletions
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sheets/bash
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@ -38,8 +38,10 @@ echo ${PIPESTATUS[0]} # replace 0 with N
for i in $(seq 1 4); do echo $i; done
# Test if a program exists in the path
command -v <program> 2>&1 >/dev/null || error "<program> not installed"
# There are false positives: aliases and functions
command -v ${program} >/dev/null 2>&1 || error "${program} not installed"
# Redirection
my_command 2>&1 > command-stdout-stderr.txt
my_command 2>&1 > /dev/null
# Please note that 2>&1 goes after
my_command > command-stdout-stderr.txt 2>&1
my_command > /dev/null 2>&1